700r4 help needed

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Nov 6, 2008 | 02:45 PM

Guest

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700r4 help needed

i have a 87 iroc-z 5.7 rebuilt 700r4 my tach is at 2800rpms when im only doing 60mph?? any suggestions?

Nov 6, 2008 | 03:00 PM

Stephen

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iTrader: (12)

Joined: Jul 1999

Posts: 12,212

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From: Bertram (outside Austin), TX

Car: 87 GTA

Engine: L98

Transmission: 700R4

Axle/Gears: Dana M78 3.27 posi

Re: 700r4 help needed

What rear gears do you have? What sized tires are you running?

Nov 7, 2008 | 10:34 AM

Atilla the Fun

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Joined: Oct 2008

Posts: 6,319

Likes: 19

From: Northern Utah

Car: seeking '90.5-'92 'bird hardtop

Engine: several

Transmission: none

Axle/Gears: none

Re: 700r4 help needed

seems like you're not getting overdrive, and if you are, you're both not getting lockup of the torque converter, and you have a very loose torque converter. If you have the 3.27:1 axle, then you again aren't getting the lockup.

Nov 7, 2008 | 01:09 PM

vbMike

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Joined: Oct 2003

Posts: 428

Likes: 5

From: Buffalo, NY

Car: 1987 Camaro IROC-Z28

Engine: TPI 350ci L98

Transmission: T56 - Hurst Shifter

Axle/Gears: BW - 3.70

Re: 700r4 help needed

Are you sure the tach is correct. It's common for them to fail and when they do they read high. When you floor it what RPM does it shift at? If it's around 5000 - 5500 then the tach is probably working fine.