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calculate you needs here http://www.ringpinion.com/Calculators/Calc_RPM.aspx

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=D>What a great thread!!!!!! I have been following this thread very closely. I want to also install the A500 out of my 91 DAK in my 70 DART. A Question was raised about the total drop in rpm at cruise. IF I remember correctly the final drive ratio on the 500 was .69. The math shows for...

It depended what was available that day when the car was built. Ive seen slant 6 cars with an 8 3/4 from the factory.

thank you sir for the correction

should be the same as my 70 if its a 112 wheelbase, I went from a /6/904/ 7 1/4 to a 360/904/ 8 3/4 and wound up with 52 1/2 after careful measurement which is only a 1/4 inch off of what 65dartman said the book gives

was hanging around dr diff's website and ran across a wide selection of new ring and pinions for the 741 and 742 very reasonable prices....I remember a post a while back where a guy was having problems finding 3.23 for a 742 new http://www.doctordiff.com/8-3-4-ring-and-pinion.html

thanks redfish 350 is exactly what i had thought also

60 bucks for the whole ball of wax right.....an a500

is this rear anywhere near the width and spring perch location of an A body, i believe it has a 3.73 in it??

I've got a 91 Dakota with a magnum v6 and a500. I drove the truck to my house. MY brother bought this truck new and its been in the family since. I have decided to part it out. The tranny is the one with the dash button to engage/disengage the od. There is absolutely nothing wrong with the...

the 8 3/4 i bought complete drum to drum with single 3.23 was supposed to have come out of a 70 duster, where would i look for id markings to verify year and such of manfacture ????????????????...it has a 741 case

Any neutral balance converter will do, if you ask here for advice on which converter to get you will get a dozen different answers....I would contact a few converter manufacturers directly .... They will take all your drive train info from you and come up with a workable solution. This is what...

96 and up are balanced with weights ON the flexplate, in this situation use a converter that has NO Weights on it for neutral balance the mounting holes will be dead on except one which you will have to hog out to be able to bolt all 4 holes when you get the assembly all set up it will be easy...

There is a recent large post on this I think in the tranny section under forums.

If I could get one locally for 200 I'd be all over it!! 4 years ago before they shot up I got one complete, incl shock mounts, housing, 3.23 single sides, 742 case chunk, drums, backing plates etc. What the guy had done was drop the whole rearend with everything all at once, even the ebrake...

a500 has a final ratio if .70 or so to 1, will drop about 8-900 rpm

explorer 8.8 or mustang same, probably can find one posi. cheap, lots of the stangs had 3.73

no... 3 1/2 of yoke inside as measured from the very edge, mark the yoke 3 1/2 up from the end that slides in the tranny and make the mark even with the very edge of the case...If you want the Mopar reference guide number and exact wording let me know

I just researched this, Mopar says 3 1/2 in from the very rear edge of the case .....

I screwed the pooch on this one, with 3.91 and 10 percent converter(3000 stall) slippage (which I Forgot about) and 25.1 inch tire I will be crossing the quarter at about 6350 and I have a 360 magnum with a stock bottom end but with Hughes valve springs . I was planning on keeping the motor to...

sounds like you have a flexplate/harmonic balancer mismatch

If I remember correctly the 904's up to 72 had 23 splines on input shaft and 72 on had 24, there may be other differences, truck may have long tailshaft

Just read that the overdrive won't survive full throttle shifts behind a motor with moderate to high horsepower.

how cheap is cheap??

I JUSt researched this,,,put the yoke in the tranny, slide it out till the center ff the u joint cap is 3 1/2 inches from the rear of the tailshaft housing, then measure from the center of the front cap to the center of the rear cap.

http://www.jegs.com/i/Energy-Suspension/355/9-9101R/10002/-1

Ive got a 742 case 3.91 gears sure grip that is dissassembled and needs clutches and spider gears. The guy who is going to rebuild it said that for 150 bucks he will reassemble the chunk (no new bearings install , (yea I know pay now or pay later...)) with all the new stuff and set the lash...

Your best sale would probably be to someone who is looking to convert a /6 auto to 4spd w/ overdrive. You have the complete package to make that happen and it would bring quite a bit more as a package deal to someone who is looking to do a complete conversion. If you included the flywheel, bell...