Quote:
Originally Posted by 1RAMAIR1
That makes 2 of us. (lol) Today we pulled the Rear Differential apart and found something unusual. The setup appears to have never been taken apart and the original GM part number stampings were found on the Ring Gear. The Build-sheet for the car says it came with 3:90 series gears. When we opened it up, the gears were 4:11. What are the chances that the Factory installed the wrong ratio gears for the car?
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I started a thread a few months ago, asking everyone here, if anyone, had a 69 TA with factory special ordered 3.90 posi rear axle.
After a long thread, it was concluded that all 69 RA III Trans Ams were 3.55 Posi rear axle cars.
Do you have the PHS for this TA and does it show special order axle?
If so, please post the PHS to your car.
Thanks Rich
__________________
Rich Johns
Owner/Operator of Pure Stock Auto Restorations Inc.
www.purestockauto.com
1969 GTO Judge Ram Air IV M21 4 speed 3:90
1970 GTO Judge Ram Air III M21 4 speed 3:90 Oshawa Built
1970 GSX Stage 1 M21 4 Speed 3.64 # 67 of 678 Original Paint
1970 GSX Stage 1 Auto 3.64 # 603 of 678
[email protected] mph 2011 Buick GS Nats Pure Stock,
[email protected] mph PSMCDR 2011
1970 GS Stage 1 Convertible Auto 3:64
[email protected] mph PSMCDR 2009
1970 GS 455 M21 4 Speed 3.42
1987 GN Astro Roof