Bobby Suth

iTrader: (2)

I've sean them on here.What ya gota do to put a truck 700r4 into a 89 Iroc?

Stephen

iTrader: (12)

Not without changing out the tail housing, for the torque arm mount.

Same for for ANY tranny from ANY car other than a 3rd gen or 4th gen. 3rd & 4th gens have a unique rear suspension that no other GM has.

92RS_Ttop

iTrader: (3)

Or you could switch to a crossmember-mounted torque arm. Just make sure the transmission is from a 2wd truck. The 4x4 trucks have different tailhousings that won't work even if you do use a crossmember mount for the torque arm

Thirdgen89GTA

iTrader: (5)

Why would you do a thing like that?

the 700R4 and non-electronic 4L60's have vehicle specific calibrations. An Astrovan 700R4 will not shift the same as a F-body 700R4. The weights on the governor in the trans are different.

Its so much extra work to make one work in an F-body, just get an F-body trans.

92RS_Ttop

iTrader: (3)

I would think a 700r4 from a truck would be calibrated to put the most torque possible to the rear wheels which would be a good thing in an F-body?

Besides, he wasn't asking if it was a good idea, just if it was possible. That's the question I answered. I never said it would be a good idea or not. I don't know what parts or junkyards he has access to. Maybe all he can get or afford is a truck transmission?

Bobby Suth

iTrader: (2)

92RS_Ttop has got it right,I've been looking for an f-body 700r4 close to me for 3 months while my Iroc sits in the shed going no where.I'd rather get it moving so somthing else dosn't go bad from sitting.I can do somthing better later in the spring or summer.I see all kinds of chevy truck trannys out there.one in town here for about 200.00.I just want to know if a 2wd 700r4 would work by changing the tailshaft off my camaro's tranny? Or do I need other stuff off of it also?Like the spline thingy.Any seals.And will one of thoughs 4L60's work out of an early 4th gen? whats the deal on them.Do any 4th gens have 700r4's that will work? I heard they are cntoled by the ECM.

Bobby Suth

iTrader: (2)

Stephen,can you help,your on line now.

Sandslot

iTrader: (2)

In addition to the comments above, they can run different line pressures as well as different fiber material and clutch pack stackup. I think I'd stick with a car trans, unless you overhaul it. Also, watch for electronic vs mechanical

Stephen

iTrader: (12)

Help how?

Because of the torque arm, the tranny HAS to be from an F-body, or the tranny crossmember HAS to have a torque arm mount. Those are the ONLY 2 way, short of eliminating the torque arm & going with a complete rear suspension, like a 4-link.

Thirdgen89GTA

iTrader: (5)

If you can find a 4L60 out of a 93' F-body I'd go for it. It is the same as a 700R4, just with a different name. EVERYTHING will bolt-up no problems. You will need the torque converter with it.

92RS_Ttop

iTrader: (3)

Thirdgen89GTA - You're right about it bolting up. However, 93+ automatics are the 4L60E, not a 4L60. It is controlled by the ECM. It won't work unless you're willing to do a full swap to a 4thgen drivetrain - engine, transmission, fuel system, wiring harness, accessories, etc.

Sandslot - The line pressures may be different, but the clutch packs are the same. A truck trans may have a few extra clutches/steels, but that in no way impacts the vehicle the trans is mounted in. All of that is internal to the transmission and the only way it would cause a problem in an F-body might be if you used the pump from an F-body 700r4 instead of the one that was originally in the truck trans if the F-body pump could not supply enough line pressure.

Bobby - Changing the tailshaft on a 700r4 requires completely disassembling the transmission. And if the tailshafts are a different length, you would also need to change the output shaft. I'm not sure of the overall lengths of an F-body 700r4 and a truck 700r4, but I believe they are the same. You'd have to take some measurements to be sure. Spline count on the output should be the same, but double-check that as well.

Thirdgen89GTA was right about the torque converter. You will also need a flywheel for a thirdgen if your car doesn't already have one or came with a manual transmission. If it came with a manual trans, then you will also need the TV cable, cooling lines, a radiator with the trans cooler built in(or an external cooler), and the shifter and its cables. You could probably get away with keeping the manual pedals but it would look funny.

Stephen

iTrader: (12)

Even if the overall lengths are the same, I wonder if the mounting point is different, between the 2 tail shafts? That could mean moving the trans mount forward or backwards.

Bobby Suth

iTrader: (2)

I've got an automatic in my car now,It an 1989 Iroc-z with the stock 350 tpi.Has not been on the road for some time.Bought it last summer and fixed the front brakes and stuff like that.Changing the altnator and tranny are the only things left before I put plates and insurance on it. I'm not to sure about me trying to take the tranny apart. I'm ok at changing parts,but i've never taken one of these apart,nor have I even sean one taken apart.I know there will be a first time,but not on this one now.I'm half tempted to buy a car for 1000 and get the tranny out and sell off the other stuff to get my money back.Is the 93 4th gen the only year that would work?I think that was a short year for production due to the moveing and change over by GM wasn't it? thanks,thats some good stuff.

Thirdgen89GTA

iTrader: (5)

The only 4L60E that would work with your setup would be a 93. Everything later is electronic.

I have a 4L60E in my GTA, but I also have the complete engine harness and LT1 out of the same car. You really don't want to get into a 4L60E without doing a Gen 2 or Gen 3 swap. You need the PCM to control the transmission.

matchbox

Thanks guys was wondering the same thing cause I took out all computer BS. Quess I will have to install the lock-up kit from TCI. Just stay with the 3rd gen tranny way cheaper.

8t2 z-chev

just about any v8,non-electronic 700r4s with the right
length output shaft should work in an f-bod by just
swapping over the f-bod tail housing and speedo gears
to the non-f-body 700r4-tranny in mine is from an'85
caprice Sometime in 1984,the input shaft torque
converter spline count was upgraded from 27 spline
to 30 spline(along with some other upgrades) so have
to make sure your converter is the right spline count
if you reuse the same converter on the different tranny.
Before i installed the caprice tranny i installed a shift
kit so it would have more z28 suitable shift action

fireburdluvr85

all you gotta do to make it work is swap tail shaft housing and take off tone ring if equipped. make sure you use your current gears to operate things. they are right that the shifting will be really different. i did the opposite for a customer. got a 92 caprice cop car 700r and put it in an 88 c1500. easy enough swap man.

juansupreme

It works,

I got an 87 blazer 700r4 tranny in my 86 Ta, I got a lot of torque, and thats what I want when traveling up and down the east coast in the summer. O! btw, My motor is from a 1992 buick roadmaster estate station wagon converted to 4bbl . Can you say "tow my boat with my t-top down"