Transmissions and Drivetrain Need help with your trans? Problems with your axle?

700R4 slipping

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Old Jan 19, 2008 | 02:41 AM
  #1  
Pontiacguy18's Avatar
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Joined: Jun 2007
Posts: 71
Likes: 1
From: Fort Collins, CO
Car: 1991 Pontiac Firebird
Engine: 305 TBI
Transmission: 700r4
Axle/Gears: 3.42 posi
700R4 slipping

Ok so I have been having problems with my tranny for the past 6-8 months. First off it slips between 1-2 2-3 and 3-4 gears, and if that isnt bad enough its burning tranny fluid. This all happens in overdrive, in drive the tranny usually doesnt slip as much, sometimes between 2-3 but thats usually it. I am stumped and wondering if I should just rebuild the whole damn thing. Thanks for your help
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Old Jan 19, 2008 | 02:49 AM
  #2  
Apeiron's Avatar
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Joined: Jan 2000
Posts: 20,981
Likes: 11
From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: 700R4 slipping

Sounds like it's definitely time for a rebuild.
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Old Feb 2, 2008 | 02:20 PM
  #3  
1991Camaroz28's Avatar
Junior Member
 
Joined: Jun 2006
Posts: 86
Likes: 1
From: Ft. Lauderdale, FL
Car: 91 Z28
Engine: 305 TPI
Transmission: TH700-R4
Axle/Gears: 3.73
Re: 700R4 slipping

the 700r4 runs too hot for it's own good. when you rebuild the trans get yourself a good after market trans cooler to protect your investment. i run a B&M that was small and easy to install.
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Old Feb 2, 2008 | 06:11 PM
  #4  
online170's Avatar
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Joined: Sep 2005
Posts: 1,951
Likes: 13
From: Ottawa, ONT
Car: 1987 Firebird
Engine: 355
Transmission: T56
Re: 700R4 slipping

Mine was doing similar things. I ditched it and installed a T56 . That doesnt help i know, but usually the 700 has some weak points, and you can diagnose the problem with the symptoms.

2-3 shift slippage can be blamed on the 3-4 clutch pack, which is the most common. The rest of the stuff you described is other things. You should definately rebuild it, or if i were you, i would buy a used one that isnt slipping and put a shiftkit in it. With a 305, you dont need to build it to race specs, you can get away with a good tranny, and the moderate upgrades, like shift-kit, new torque converter, with a slightly higher stall, corvette servo, and a tranny cooler.
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