Question about 1988 Pontiac Firebird

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Speedometer reads too high

I have an 89 Formula 350. I just swapped the rear from an open diff 2.73 to a limited slip 4.10. now at 70mph it reads 100mph. I can't find a sleeve to fit the larger speedo gear. anyone know where I can find one or suggestions on how to ditch the governor?

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With the difference in ratio, the drive wheels rotate at a faster rate of RPM. you will also notice that the motor revs higher RPM as well and that will not change. However, you may need to change the speedo cable to resolve the speedometer discrepancy.

Posted on Sep 17, 2009

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Posted on Jan 02, 2017

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1 Answer

02 explorer would like to swap differentials my truck is 02 v6 4x4 3.55 open diff donor truck is 02 explorer v8 4x4 with 3.73 limited slip will this swap work without problems


It's not going to cause "problems" per say, but it will change the gearing ration between the engine and the wheels. A higher number will give you more low end pulling power (better acceleration), and lower top speed, and, theoretically, less fuel mileage. Limited slip prevents one wheel from turning faster than the other (e.g. - spinning in mud or snow), causing the vehicle to lose traction and turn to one side.

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What oil must i put in the diff of a ford 4000 tractor with the oil pump for lift inside the diff


80-90 oep diff oil unless it is a limited slip diff in which case you use special limited slip diff diff oil
don't know if it is limited slip diff diff
you can check by jacking up the rear end and having a friend turn a rear wheel
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I HAVE A TOYOTA HIACE HIGH TOP 1998 2.4 PETROL 5 SPEED MANUAL. I WOULD LIKE TO KNOW WHAT TYPE OF DIFFERENTIAL OIL SHOULD I USE THANKS SUE


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Jan 19, 2017 | Toyota Cars & Trucks

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I have a 97 vzj95 prado 3.4lt v6 Recently the front diff seized and I've replaced it but now on turns while accelerating I'm hearing a clunk from the rear diff... Is this a wind up issue? Thanks


Yes it is a wind up of the axles and not the drive shafts. Your car has a limited slip diff and it is locking up.
When you are accelerating the diff locks up and your wheels are rotating at different rates while turning. This causes the axles to twist until the pressure causes the Limited Slip Diff to slip.
My guess would be that someone has changed the diff oil with non Limited Slip Diff oil.

May 12, 2015 | Cars & Trucks

1 Answer

Inaccurate Speedometer


Your rear diff has a different ratio gear in it. Find out what ratio gear your car came with, remove your diff gear, and replace with same ratio that it came with from factory, that will fixya.

Dec 03, 2013 | 1994 Pontiac Firebird

1 Answer

Hello, with all 4 wheels off the ground,engine running and in gear only 3 wheels are turning. The right front does not. is this normal?


Unless you have a positraction rear differential, I'm surprised that even three are turning! Four wheel drive is really two wheel drive because both differentials are "open" type. In an open diff, only one wheel has power at any given time. With a positraction, or "limited slip" rear diff, both rear wheels push with fairly even force but the outer wheel is allowed to slip when going around turns. Only true four wheelers have either a limited slip on both ends or "locked" units but it is impossible or really difficult to drive anything like that on the street. If you hold the left front wheel from turning unless the locking unit is broken, the right front should turn.

May 10, 2010 | 1998 Jeep Grand Cherokee

1 Answer

4wd is it working properly or not


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Apr 10, 2010 | 1994 Isuzu Trooper

1 Answer

I need to know what ratio the axle in a 2006 f-350 has in it. i can not find the decoder....HELP PLEASE


The following lists the gear ratios on rear axles.
  • 37 — 3.73 non-limited slip
  • 3L — 3.73 limited slip
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  • 43 — 4.30 non-limited slip
  • 48 — 4.88 non-limited slip
  • 4L — 4.30 limited slip
  • 4N — 4.10 limited slip
  • 4W — 4.10 limited slip (ambulance package)
  • 53 — 5.38 non-limited slip
  • 5L — 5.38 limited slip
  • 8L — 4.88 limited slip

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