Long shaft (9") Th350 with stock driveshaft
04-04-2015 | 09:28 PM
#1
Thread Starter
Joined: Jul 1999
Posts: 11,804
Likes: 95
From: SALEM, NH
Car: '88 Formula, '95 Formula
Engine: LC9 , LT1
Transmission: TKX , 4L60E
Axle/Gears: 3.50 9" , 3.23 10bolt
Long shaft (9") Th350 with stock driveshaft
I put my new TH350 in the other day. This is a 1LE driveshaft. Notice how far the yoke sticks out. Everyone says a stock driveshaft will work with a 9" th350 but this doesn't seem like enough yoke engagement to me...
-- Joe
-- Joe
04-05-2015 | 06:55 AM
#2
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Car: 88 GTA
Engine: Built 355 to install
Transmission: Built turbo 350
Re: Long shaft (9") Th350 with stock driveshaft
That definitely isn't in far enough Joe, it doesn't look like it's half way into the bushing.
I'm doing the same install in my 5spd car and hope I don't end up short, I don't recall what my shaft came out of. After reading on here I bought a aluminum three rivers off sleezbay # 12564004, it measures 47 1/8" from center of rear joint to the end of the yoke.
Can you post the length of your's ?
I'm doing the same install in my 5spd car and hope I don't end up short, I don't recall what my shaft came out of. After reading on here I bought a aluminum three rivers off sleezbay # 12564004, it measures 47 1/8" from center of rear joint to the end of the yoke.
Can you post the length of your's ?
04-05-2015 | 11:05 AM
#3
Thread Starter
Joined: Jul 1999
Posts: 11,804
Likes: 95
From: SALEM, NH
Car: '88 Formula, '95 Formula
Engine: LC9 , LT1
Transmission: TKX , 4L60E
Axle/Gears: 3.50 9" , 3.23 10bolt
Re: Long shaft (9") Th350 with stock driveshaft
That definitely isn't in far enough Joe, it doesn't look like it's half way into the bushing.
I'm doing the same install in my 5spd car and hope I don't end up short, I don't recall what my shaft came out of. After reading on here I bought a aluminum three rivers off sleezbay # 12564004, it measures 47 1/8" from center of rear joint to the end of the yoke.
Can you post the length of your's ?
I'm doing the same install in my 5spd car and hope I don't end up short, I don't recall what my shaft came out of. After reading on here I bought a aluminum three rivers off sleezbay # 12564004, it measures 47 1/8" from center of rear joint to the end of the yoke.
Can you post the length of your's ?
My driveshaft is gm # 10084375 which is a spicer made unit.
What is your ctr-to-ctr measurement?
-- Joe
04-05-2015 | 11:24 AM
#4
Thread Starter
Joined: Jul 1999
Posts: 11,804
Likes: 95
From: SALEM, NH
Car: '88 Formula, '95 Formula
Engine: LC9 , LT1
Transmission: TKX , 4L60E
Axle/Gears: 3.50 9" , 3.23 10bolt
Re: Long shaft (9") Th350 with stock driveshaft
According to this chart, the TH350 with the 9" tailshaft should be 5/8" longer than the 700R4.. Which tells me that I should not be having a problem.
Hrmm.. Maybe my aftermarket LCA's are too long..
-- Joe
Hrmm.. Maybe my aftermarket LCA's are too long..
-- Joe
04-05-2015 | 11:48 AM
#5
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From: On TGO
Car: 88 GTA
Engine: Built 355 to install
Transmission: Built turbo 350
Re: Long shaft (9") Th350 with stock driveshaft
Mine measures 41" center, now I'm worried I'm gonna be short. I just measured center of bolt on my stock LCR and got 19" if you want to check that....
04-05-2015 | 02:30 PM
#6
Joined: Jul 2000
Posts: 6,337
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From: Aridzona
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R
Re: Long shaft (9") Th350 with stock driveshaft
Measure how much actual spline engagement it has. It should have 100% bushing engagement. If it does, and plenty of spline eng, it's likely fine, but not optimal.
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04-08-2015 | 05:40 AM
#8
Thread Starter
Joined: Jul 1999
Posts: 11,804
Likes: 95
From: SALEM, NH
Car: '88 Formula, '95 Formula
Engine: LC9 , LT1
Transmission: TKX , 4L60E
Axle/Gears: 3.50 9" , 3.23 10bolt
Re: Long shaft (9") Th350 with stock driveshaft
Nope. Been busy cleaning out my dad's house so we can put it on the market.
Hopefully tonight I'll have ten minutes to pull the shaft and measure my spline engagement.
My car is on the lift right now with the suspension hanging down. I suspect that when the car is on the ground, the control arms straighten out and as the rear end swings up it actually pulls the driveshaft out more, yes?
-- Joe
Hopefully tonight I'll have ten minutes to pull the shaft and measure my spline engagement.
My car is on the lift right now with the suspension hanging down. I suspect that when the car is on the ground, the control arms straighten out and as the rear end swings up it actually pulls the driveshaft out more, yes?
-- Joe
04-08-2015 | 05:55 AM
#10
Thread Starter
Joined: Jul 1999
Posts: 11,804
Likes: 95
From: SALEM, NH
Car: '88 Formula, '95 Formula
Engine: LC9 , LT1
Transmission: TKX , 4L60E
Axle/Gears: 3.50 9" , 3.23 10bolt
Re: Long shaft (9") Th350 with stock driveshaft
I'm trying to wrap my head around the geometry, but I believe as the control arm straightens it pulls the yoke out of the transmission, so whatever play I have now will be worse when the suspension is loaded.
-- Joe
-- Joe
04-08-2015 | 06:50 AM
#11
Joined: Oct 2013
Posts: 2,527
Likes: 127
From: Louisville, KY
Car: 1983 Z28
Engine: 385 Fastburn
Transmission: T-5
Axle/Gears: BorgWarner 9-bolt posi, 3.27 gears
Re: Long shaft (9") Th350 with stock driveshaft
Something has to be off, because I have the long-tailed TH350 in my car and utilized the stock '83 drive shaft. Fit perfectly.
04-08-2015 | 07:42 AM
#12
Thread Starter
Joined: Jul 1999
Posts: 11,804
Likes: 95
From: SALEM, NH
Car: '88 Formula, '95 Formula
Engine: LC9 , LT1
Transmission: TKX , 4L60E
Axle/Gears: 3.50 9" , 3.23 10bolt
Re: Long shaft (9") Th350 with stock driveshaft
I don't know what could be off. Motor can't go back any, as it is getting the 9 o'clock trans bolt in is a PITA in regards to firewall contact. I measured my LCA's and I've got 19" just like Rob. I doubt the car stretched two inches haha.
I'm using a 4th gen diff. I don't believe it places the yoke any deeper into the housing.
-- Joe
04-08-2015 | 08:08 AM
#13
Thread Starter
Joined: Jul 1999
Posts: 11,804
Likes: 95
From: SALEM, NH
Car: '88 Formula, '95 Formula
Engine: LC9 , LT1
Transmission: TKX , 4L60E
Axle/Gears: 3.50 9" , 3.23 10bolt
Re: Long shaft (9") Th350 with stock driveshaft
Found a picture from 2006 of my '91 with a alum driveshaft. I can't tell if it's a 1LE or LS1 driveshaft from the pictures, but it looks like it didn't quite go all the way in either.
edit: it's not a 1LE shaft, the ujoints give it away. 1LE shafts have 1310 ujoints with clips. So it's a 4th gen driveshaft. So it could also be from a T56 and that's why it was short. 2006 was a long time ago.
-- Joe
edit: it's not a 1LE shaft, the ujoints give it away. 1LE shafts have 1310 ujoints with clips. So it's a 4th gen driveshaft. So it could also be from a T56 and that's why it was short. 2006 was a long time ago.
-- Joe
Last edited by anesthes; 04-08-2015 at 08:18 AM.
04-08-2015 | 08:11 AM
#14
Joined: Oct 2013
Posts: 2,527
Likes: 127
From: Louisville, KY
Car: 1983 Z28
Engine: 385 Fastburn
Transmission: T-5
Axle/Gears: BorgWarner 9-bolt posi, 3.27 gears
Re: Long shaft (9") Th350 with stock driveshaft
Got any pictures?
I don't know what could be off. Motor can't go back any, as it is getting the 9 o'clock trans bolt in is a PITA in regards to firewall contact. I measured my LCA's and I've got 19" just like Rob. I doubt the car stretched two inches haha.
I'm using a 4th gen diff. I don't believe it places the yoke any deeper into the housing.
-- Joe
I don't know what could be off. Motor can't go back any, as it is getting the 9 o'clock trans bolt in is a PITA in regards to firewall contact. I measured my LCA's and I've got 19" just like Rob. I doubt the car stretched two inches haha.
I'm using a 4th gen diff. I don't believe it places the yoke any deeper into the housing.
-- Joe
04-08-2015 | 08:12 AM
#15
Joined: Oct 2013
Posts: 2,527
Likes: 127
From: Louisville, KY
Car: 1983 Z28
Engine: 385 Fastburn
Transmission: T-5
Axle/Gears: BorgWarner 9-bolt posi, 3.27 gears
Re: Long shaft (9") Th350 with stock driveshaft
04-08-2015 | 12:04 PM
#16
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From: On TGO
Car: 88 GTA
Engine: Built 355 to install
Transmission: Built turbo 350
Re: Long shaft (9") Th350 with stock driveshaft
Joe,
The rear end doen't move forward or back as the suspension moves up or down, it only moves up and down.
With the suspension loaded the rear end is closer in line with the trans, as you unload the suspension that line drops or moves the rear further down out of line.
Thus, you should see the drive shaft move into the trans further if you lowered the car down on jack stands under the axle housings while on your lift.....
Last edited by Restrorob; 04-08-2015 at 12:10 PM.
04-08-2015 | 12:10 PM
#17
Thread Starter
Joined: Jul 1999
Posts: 11,804
Likes: 95
From: SALEM, NH
Car: '88 Formula, '95 Formula
Engine: LC9 , LT1
Transmission: TKX , 4L60E
Axle/Gears: 3.50 9" , 3.23 10bolt
Re: Long shaft (9") Th350 with stock driveshaft
Joe,
The rear end doen't move forward or back as the suspension moves up or down, it only moves up and down (remember your torque arm will keep it from go'n fwd. or back).
With the suspension loaded the rear end is closer in line with the trans, as you unload the suspension that line drops or moves the rear further down out of line.
Thus, you should see the drive shaft move into the trans further if you lowered the car down on jack stands under the axle housings while on your lift.....
The rear end doen't move forward or back as the suspension moves up or down, it only moves up and down (remember your torque arm will keep it from go'n fwd. or back).
With the suspension loaded the rear end is closer in line with the trans, as you unload the suspension that line drops or moves the rear further down out of line.
Thus, you should see the drive shaft move into the trans further if you lowered the car down on jack stands under the axle housings while on your lift.....
So maybe this is perfectly fine and when my suspension is loaded it will slide in a bit..
-- Joe
04-08-2015 | 12:15 PM
#18
Joined: Oct 2013
Posts: 2,527
Likes: 127
From: Louisville, KY
Car: 1983 Z28
Engine: 385 Fastburn
Transmission: T-5
Axle/Gears: BorgWarner 9-bolt posi, 3.27 gears
04-08-2015 | 07:58 PM
#19
Joined: Jul 2000
Posts: 6,337
Likes: 49
From: Aridzona
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R
Re: Long shaft (9") Th350 with stock driveshaft
Joe,
The rear end doen't move forward or back as the suspension moves up or down, it only moves up and down.
With the suspension loaded the rear end is closer in line with the trans, as you unload the suspension that line drops or moves the rear further down out of line.
Thus, you should see the drive shaft move into the trans further if you lowered the car down on jack stands under the axle housings while on your lift.....
The rear end doen't move forward or back as the suspension moves up or down, it only moves up and down.
With the suspension loaded the rear end is closer in line with the trans, as you unload the suspension that line drops or moves the rear further down out of line.
Thus, you should see the drive shaft move into the trans further if you lowered the car down on jack stands under the axle housings while on your lift.....
While the 82-02 chassis is a poor example because of minimal slip yoke travel, the yoke is furthest into the transmission with the suspension at full droop. Not with the suspension in compression. Joe has it right.
And yes, some 4th gen shafts are shorter.
04-09-2015 | 07:12 AM
#21
Joined: Oct 2013
Posts: 2,527
Likes: 127
From: Louisville, KY
Car: 1983 Z28
Engine: 385 Fastburn
Transmission: T-5
Axle/Gears: BorgWarner 9-bolt posi, 3.27 gears
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