 DHMelton
Silver Supporting Member
Posts: 163
Loc: Central Arizona
Reg: 04-10-22
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11-26-22 02:31 PM - Post#2850544
GA code on both the axle tube and broadcast sheet. 0121 build date that is proper for the Feb 6th car build date
I was under the impression that TH400 cars came only with 2.73 gears? Or maybe that was just the default ratio?
Obviously I like 3.07 better, my old 66/396 TH400 car had a 2.73 gear. Good for highway, but kind of doggy on accel. Too bad it isn't posi, I will have to rectify that.
Doug
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 toro455
"7th Year" Silver Supporting Member
Posts: 945
Loc: Western NY
Reg: 06-15-02
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11-26-22 03:38 PM - Post#2850549
In response to DHMelton
Doug,
Take a look into the TrueTrac posi:
https://www.eaton.com/us/en-us/catalog/diff erentia...
I discovered them just after installing an Auburn clutch style in a car. Driving a car back-to-back with the a clutched versus the Truetrac and there's no way I would ever go back.
I first put one in a 2001 lease truck and put 30K miles on it. I then put one in the 2003 truck, pulled the Gov-lock at roughly 300 miles, I bought. That has about 115K miles on it. I have one in my Chevelle from Moser and I have one in the 1968 Impala.
The only criticism I've heard is if you are rock climbing and one wheel is completely unloaded. In that situation it can put a lot of torque on the side in contact.
If you keep the differential gears it's done without removing the rear axle from the car.
Scott
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DHMelton
Silver Supporting Member
Posts: 163
Loc: Central Arizona
Reg: 04-10-22
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11-26-22 04:07 PM - Post#2850553
In response to toro455
Yeah, I am aware of those, i have an Eaton 33 spline in the narrowed 12 bolt in my '61 Corvette.
Changing a 12 bolt posi is a little more complex than doing a 10 bolt, but as long as one keeps the shims and the shim distance is the same, the new posi unit should go in without any issues.
Doug
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 BigDogSS
"14th Year" Silver Supporting Member
Posts: 5100
Loc: SoCal
Reg: 12-21-01
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11-29-22 10:25 AM - Post#2850697
In response to DHMelton
....I was under the impression that TH400 cars came only with 2.73 gears? Or maybe that was just the default ratio?
Obviously I like 3.07 better, my old 66/396 TH400 car had a 2.73 gear. ....Doug
Does your car have air conditioning? See below:
 Attachment: Axle.JPG (138.34 KB) 3 View(s)
1967 Chevrolet Impala SS convertible 327 - Ermine White C1 - VCCA Senior Award
1967 Chevrolet Impala SS Sport Coupe 396 - Marina Blue FF - personal "barn-find" lol
1965 Chevrolet Malibu 4D Wagon |
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SSuper Dave
Member
Posts: 506
Loc: Pearland TX
Reg: 10-02-05
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11-29-22 07:01 PM - Post#2850721
In response to BigDogSS
My '68 Caprice with a 327/275 and TH400 has 3.07's spec'ed on the build sheet.
1968 Caprice coupe, 327/275, TH400, Ash Gold/Ivy Gold, Tach Dash, Tilt, Buckets, Console, AM/FM, Rear Defog, Disc and Rallys.
1970 El Camino, 350, TH400, 12 bolt posi, a blank slate! |
Edited by SSuper Dave on 11-29-22 07:02 PM. Reason for edit: No reason given.
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