I've always seen this on shift kits... "allows you to hold a gear at any rpm"- yet, I've always been able to keep a gear, no matter what the engine rpm's are. In fact, I've made some racing "mistakes" where I'm in 2nd, but -think- I'm in 3rd, and have dropped the trans down into first- ouch.

What happens on these trannies that can't hold a gear? Does the trans upshift on its own, even though the stick's in, say, second?

I wonder if it's year-related... I have an '86 700r4, and I know later years were changed, such as the '87's auxiliary valve body. I wonder if those changes prevent "holding a gear at any rpm", or, if it's just fancy words that are used to sell a shift kit.


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-Tom P (Hot rodded 1986 Firebird 2.8l)

 

I believe you've figured them out lol I have always been able to hold a gear, in fact I ran 1st up to 5500 by accident wed. at englishtown cause i forgot to shift...doh. even if the trans will shift out of a gear at certain RPM you'll probably never rev that high

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85 Z28- 350, Comp 262, Edelbrock Performer intake, Edelbrock 600 cfm carb and Edelbrock cat back, Summit headers and vette servo
-JVC, Eclipse, Pioneer, MTX, Phoenix Gold, Planet Audio

 

my 86 iroc will too.I have heard of 83-84 and the 89 on not being able to but I dont know.I know one guy just posted that his 83 shifts with the stick still in first.so I have no clue.There was this post before and some cars could and some not,I dont get it.

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~mike~86 IROC-Z

 

i am not sure but i know many cars do this. we were beating the crap out of a dodge interpid rental car...put it in first and mat the pedal...it will **** through the gears on its own. once the tranny builds up soo much pressure it will shift (i think) so it is normal i would say. good for it? i couldnt imagine it would be good but i am no tranny tech.

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87 z28 bowtie aluminum 420small block dry sump crower lt. wt. knife edged crank oliver lt wt rods brodix track 1's super ram intake slp 1 3/4 headers accel dfi art carr 700 r4 3.42 gears ssm sub frame/ladder bars.....other parts on the way ,soon to be finished!! couple more weeks!!!

http://people.ne.mediaone.net/gdm

 

My dads 86 GMC 4x4 "NON CC no tc lockup" Will shift into second even if its in 1st at about 35mph. So we can eliminate the computer doing the shifting. It wont shift into 3rd though unless you actually put it in 3rd. One would think that sice it goes from 1st to second locked in 1st that if you put it in 2nd it would go to 3rd but it wont. So Agree with 87tpi420 its pressure related Gm safty thing.
SSC

Edit forgot the point This trans in my dads truck is a fresh rebuild not the original. the original one with a B&M shift kit would hold gear.?????

[This message has been edited by SSC (edited August 31, 2001).]

 

It depends on the calibration of the tranny. This applies to not only the 700 but all of the GM trannies (and at least some if not all of the other US makes). ALL 700's that come from the factory WILL upshift out of manual first at some RPM, it's just that some of you will wipe out some valves in the process! These usually are the factory hot rod types, but many times they will be ABLE to rev higher than, say a truck will.

You see, the factory knows that people will see if the redline really is just that or, that if someone is pissed and figures they will get a new engine if they keep it in first up to 90 MPH so they designed in an override feature. The new cars can track this sort of thing too so Big Brother really is watching you now!

On that Intrepid, when you move the shifter you might be surprised to know that the Manual Valve inside the tranny (the one the shifter moves) does not even MOVE when you go from Drive down to Low! This is merely telling the computer (through the manual lever position sensor) what you would like to do. The computer then decides if that is OK to do.

[This message has been edited by transfixleo (edited September 01, 2001).]

 

Mine forces a shift at about 6300--I wasn't looking that close. Burn-out got a little carried away. The old BFG Comp T/A VR's would really spin easy.


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350 with stealth intake, holley carb, 470 lift cam. 700r4 with .5 boost valve, vette servo, tci lock-up kit, B&M megashifter. Richmond 3.73 gears, powertrax locker, timkin bearings, synthetic lube. Custom 3 inch single into 2 2.5 pipes. 1 1/2 drop springs, 1 5/16 solid front sway bar, 1 inch rear bar, custom subframe connectors, custom LCA relocation brackets. Kobel ground FX, currant red metallic paint. Lots of other stuff...
82camaro