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Author Topic: Rear End Ratios  (Read 1680 times)

Titsy

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« on: January 17, 2008, 10:53:51 am »
Anyone know what the standard rear end ratio behind an LT1 and T-56 in a 4th gen would be?
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55starchief

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« Reply #1 on: January 17, 2008, 11:29:11 am »
Should be a tag on the diff with a number or a colored spot thats the usual way
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Titsy

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« Reply #2 on: January 17, 2008, 11:31:30 am »
Or check the RPO codes in the glove box... I know I know... I just wondered if anyone knew what it was likely to be off the top of their heads...

Can whoever is at the barn next take a photo of the RPO codes in the glove box please...
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55starchief

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« Reply #3 on: January 17, 2008, 11:53:06 am »
Quoting: Titsy

Can whoever is at the barn next take a photo of the RPO codes in the glove box please...



think thats gone to the great dumpster in the sky
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Titsy

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« Reply #4 on: January 17, 2008, 11:56:09 am »
Rob said it was still there...
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55starchief

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« Reply #5 on: January 17, 2008, 11:58:42 am »
Quoting: Titsy

Rob said it was still there...


He had hacked the dash apart last weekend matey for the parts people needed
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Big Mouse

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« Reply #6 on: January 17, 2008, 12:03:51 pm »
Should be either a 3.23 or 3.42 (after 93?)
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Titsy

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« Reply #7 on: January 17, 2008, 12:08:00 pm »
The TA was a '93...
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Big Mouse

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« Reply #8 on: January 17, 2008, 12:08:29 pm »
then it should be a 3.23 - there should be a code on the door panel identifying what rear end it has
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Titsy

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« Reply #9 on: January 17, 2008, 12:10:35 pm »
Cheers Ray!

Is the drivers door still there???
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Big Mouse

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« Reply #10 on: January 17, 2008, 12:22:10 pm »
sorry, I thought you meant on your own car. If it was the one just cut up then as stock it should have been fitted with a 3.23, but the changeover was 93-94 so it could well have the 3.42.

You could always take it apart and count the teeth or try the old fashioned way -  raise both tires off of the ground, turn both tires at the same time one complete turn, at the same time count the turns of the drive shaft, this should be your ratio.

TBH I've never tried it so whether its accurate I have no idea.
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Titsy

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« Reply #11 on: January 17, 2008, 12:35:09 pm »
My current ration is 2.73...

The intention is to rebuild the TA axle and strengthen it ready to swap straight on to the 'maro... Then sell the old one...
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Big Mouse

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« Reply #12 on: January 17, 2008, 01:14:41 pm »
Strengthen it? Why, what are you planning to do with it?

Your existing 2.73 is almost certainly in a Series 2 carrier; the 3.23/3.42 should (although some weren't) have been in a Series 3 carrier which is larger and stronger on account of the manual box being capable of hitting the wheels harder.

Have you physically measured it; clearance issues are not unknown in this type of swap if the carrier is bigger. We had clearance problems when I tried swapping to a Series 3 axle; the bump stops all had to be moved and reset; the torque arm had to be changed, the exhaust rerouted - gave it up as a bad idea and left it alone but that was in a later car.

Unless you're planning on upping the torque the engine makes by a considerable amount I'd have thought the axle was fine as it is - mine ran into the 11's, 1.5 60ft times and on drag radials without any problems from a Series 2 carrier with a thick gear set, the axle equivalent of being made out of glass and rice crispies!
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Big Mouse

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« Reply #13 on: January 17, 2008, 01:21:54 pm »
Oh, and be prepared to learn how to drive in the wet all over again

My first go had me facing the opposite way to the direction I was supposed to be going in the middle of a crossroads having doe a fiull 180 degree spin
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Titsy

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« Reply #14 on: January 17, 2008, 01:27:32 pm »
Thanks for the info Ray, I will investigate further before doing anything stupid...
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Roadkill

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« Reply #15 on: January 17, 2008, 01:29:28 pm »
Quoting: Big Mouse
Oh, and be prepared to learn how to drive in the wet all over again


Hehehe, my 3.73's great fun.  Not.

THe door's still there, AFAIK . . . Why not just count the revolotions . . . it's quite accurate.
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Roadkill

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« Reply #16 on: January 17, 2008, 01:32:21 pm »
As for strength - the TA's axle should see you good for 500BHP . . . there's plenty of guys stateside running good times with stock rears . . .

A good service and inspection and you'll be good to go !
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Titsy

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« Reply #17 on: January 17, 2008, 01:41:25 pm »
Quoting: Roadkill
A good service and inspection and you'll be good to go !


That was pritty much the plan, with (maybe) the addition of a Rear-End Support Cover to replace the pressed tin one that is currently fitted...
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Big Mouse

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« Reply #18 on: January 17, 2008, 02:10:02 pm »
Quoting: Titsy
That was pritty much the plan, with (maybe) the addition of a Rear-End Support Cover to replace the pressed tin one that is currently fitted...

Honest, you won't need one unless you're going to start pushing the car really hard, like over 450-500bhp

As Dean says, a good service and it will be good to go
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EDGE

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« Reply #19 on: January 17, 2008, 02:28:25 pm »
Quoting: Roadkill
Hehehe, my 3.73's great fun. Not.


PAH!!!  Light-weights... I have 3.73's on the Saleen and on the old truck I had....


4.10's in a dana 60 Ford 9"... now that was lairy !!!  You had to wind up the motor to about 3k, let the clutch out to biting point and then a TOUCH more, the rear suspension would get wound up and on dumping the clutch the truck would hop forwards about 10 feet and then it was away...... trounced most cars off the lights.... probably due to sheer shock factor!!!
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Titsy

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« Reply #20 on: January 17, 2008, 02:31:14 pm »
Quoting: Big Mouse
unless you're going to start pushing the car really hard, like over 450-500bhp


That's the long term plan...
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55starchief

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« Reply #21 on: January 17, 2008, 02:32:44 pm »
If you have a proper motor like a pontiac you dont need tall gears as you have the torque. Most poncho motors only need 3.23 max
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Titsy

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« Reply #22 on: January 17, 2008, 02:34:36 pm »
Yeah, but Pontiac motors are a bit elitest for us common folk...
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Roadkill

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« Reply #23 on: January 17, 2008, 03:00:46 pm »


Plus they're big and bulky - slowing you down.

Quoting: Titsy
with (maybe) the addition of a Rear-End Support Cover to replace the pressed tin one that is currently fitted...


The other advantage to those (IRO $180, btw) is they have drain plugs, which make for easier services.

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Incursus

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« Reply #24 on: January 17, 2008, 03:17:44 pm »
Quoting: EDGE
Quoting: Roadkill
Hehehe, my 3.73's great fun. Not.

PAH!!! Light-weights... I have 3.73's on the Saleen


3.91 on the Duster.   bring it on ditch
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