what type of rear end?

[1970artcarrjavelin]

what kind of rear end came in a 70 sst 390 from the factory? It is the stock housing just modified internally, 5.00 gear and a locker, but i guess the locker could be factory, not sure here.

[tufcj]

Should be an AMC 20. Perfectly round cover with 12 bolts.

[1970artcarrjavelin]

thanks, I was just wondering how hard gears are going to be to find for it.
I want to change it to a 4.10 or something in that range.

[tufcj]

Most everyone has gears for them. Same center section that was used in Jeep CJs until 1986. You can get gears at Jeep sites all the way up to 4.88. I went with 3.73s in my 69 AMX (390/auto, 3.15 gears stock). With 26" tires and those gears I'll be at nearly 3500 RPMs at 75 MPH. I didn't want to rev it higher than that if I take it on the highway. Kind of a compromise between off-the-line power and highway revs.

Bob
tufcj

[jogiiara]

You know you could toss in a 5 speed and fix that high rev cruise.....

[Holeshot]

What 5-speed might that be??

The T-5 is not up to the amount of power that can be made by a good running AMC V8. The Rebel Machine had a 390 with a cast-iron version of the R4B and was rated at 430 ft/lbs. of torque. A modded 390/401 can go to 500/500 quite easily. Add traction to that equation and you have a problem.

Richmond no longer sells 5 or 6 speeds for AMC. If you find me one, I have a $100 bill for your effort.

The AMC20 will make a long streak of 90wt for the tow truck to follow.

An early (65~72, 65 style being a little narrower at the flanges) Mustang nine-inch is practically a drop-in, very little changes. Bigger U bolts, shock mounts to fit the bigger U bolts, & an adapter U joint. Piece-O-cake.

If you are wanting to sell the locker & gear, it may be the rare Group19 goodies and worth a fair chunk of change, enough to cover the upgrade to the Ford 9" with whatever gears you want, traction bars, plus a posi for it.

[Holeshot]

Check out the '70 Javelin T/A pic in this thread:

http://www.bulltear.com/forums/viewt...?p=32543#32543

[tarior]

What 5-speed might that be??

The T-5 is not up to the amount of power that can be made by a good running AMC V8. The Rebel Machine had a 390 with a cast-iron version of the R4B and was rated at 430 ft/lbs. of torque. A modded 390/401 can go to 500/500 quite easily. Add traction to that equation and you have a problem.

Richmond no longer sells 5 or 6 speeds for AMC. If you find me one, I have a $100 bill for your effort.

The AMC20 will make a long streak of 90wt for the tow truck to follow.

An early (65~72, 65 style being a little narrower at the flanges) Mustang nine-inch is practically a drop-in, very little changes. Bigger U bolts, shock mounts to fit the bigger U bolts, & an adapter U joint. Piece-O-cake.

If you are wanting to sell the locker & gear, it may be the rare Group19 goodies and worth a fair chunk of change, enough to cover the upgrade to the Ford 9" with whatever gears you want, traction bars, plus a posi for it.

Boy, I shore hope the T-5 I'm putting in my Rebel holds up at least for awhile.
BTW, won't a Chevy manual trans work? I know it will bolt to the bell housing, and the input shaft is 1-1/8" 10 spline, but I don't know about the pilot lenght.

[Holeshot]

I'm slowly getting some tranny data edited & uploaded to my website....

The discontinued Richmond "Street-Five" for AMC...







The crank on the left is early, right is '72+...


AMC manual trans table...
http://www.american-powersports.com/...nual_trans.htm

TONS of trans info, including AMC/Jeep:
http://www.american-powersports.com/...s/am_trans.htm

Common tranny ratios...
http://www.american-powersports.com/...ans_ratios.htm

Adapt a Ford trans to AMC...
http://www.american-powersports.com/...ford_to_am.htm

Flywheels...
http://www.american-powersports.com/..._flywheels.htm

Here's the base URL for trannies...you can navigate it like an FTP site:
http://www.american-powersports.com/amc/tech/trans/

[tarior]

Ahh..