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2112, you would shorten your driveshaft 2.25in only if you were changing from a 7 1/4 to an 8 3/4 rear. I can't remember the difference for an 8 1/4. Orv

NorthernSwede. If you don't care if you have a stock floor shifter, use one of Lokars' shifter. I have a Lokar double bend Nostalgia shifter in my 65 Valiant with a bench seat. There are other aftermarker shifters out there, get Summit or some other vendor cataloge or go online and find one.

Small Block. Great info but I was under the impression that a 489 case was 1 7/8" (1.875) and a 742 had a 1 3/4" (1.750). The 741 has 1 3/8" (1.375). By the way the Ford 9" has a 1.303" if I'm not mistaken. Orv

Bobscuda67- I have had a Lock Rite in my '65 Valiant (built 360, 727, 8 3/4) for over 2 years and 10K miles. Unless you like to have a heavy foot going around corners in town it is very streetable.

Chewy, casting # 1820657= '57-64. 2070741= 64-72. About as close as it gets. OG

inkjunkie, Detroit makes a great electric locker, much simpler than an air locker, no compressor etc. Open rear until you flick the switch. Auburn also makes one but it is in conjuction with their posi unit. I know what you mean about different size tires in case of a flat. I run a Richmond...

Snake, my B&M cable shifter went south within 300 miles. Replaced it with a Lokar Nostalgia double bend, NO cable, just solid rod, looks *****'n and works flawlessly.

340Mopar is right. 741 case pinion is 1.375, Ford 9" is 1.313. As you can see the "small" Mopar is larger than the exalted Ford 9" in pinion size, thus should be A OK.

god.favored, Cudavert is right in regards to the Rambler OD. But Columbia made a very popular 2 speed rearend that was installed in many 30's and 40's Fords. Every now and then a car is listed on Ebay or some other auction site with the Columbia option.

lilredridinghoo, Performance Automotive Transmission Center 2134-A E. Texas St. Bossier City, Louisiana, 71111 www.transmissioncenter.org

c. stanley. The PATC website says short ones are used for electric speedos which I assume your early car does not have.

duster maniac, You might be able to correct it buy installing a smaller driven gear. You're speedo is approx. 24% slow. For example if you have a 36 tooth driven gear you would need a 28 tooth driven gear. I don't know if they make such a small gear. If not, then as Fishy68 says you will need...

DesertRat, since the 8 1/4 is actually narrower than an A-body 7 1/4' 53.20" vs. 51.40" (1.8" total or .9" on either side) it should be an easy fit. I did a 7 1/4 to and early 8 3/4 (same measurements as above) in my '65 Valiant with no problems. Have a good day.

RedFish, 7 1/4 in. rear centerline of axle to centerline of rear u-joint is 10.09 inches. 8 1/4 is 11.69 for same measurement. Hence, shorten driveshaft 1.6 inches. Correct me if I'm wrong, but aren't both a 67 and a 75 considered late a-bodies with the same wheelbase? If it was a 66 it...

silver fox. From what I understand if you don't run above the stall it overheats the trans fluid which can damage the trans after a while. The way I check stall is left foot on brake, bring up the rpm's and see at what rpm's the rear tires start to spin. Just an approximation, but close. I...

DesertRat, 7 1 /4: cover has nine bolts. 8 1/4 cover has 10 bolts. 8 3/4 does not have a removable cover.

reefkeeper, formulas340 is on the mark. If the 15" tire is larger it would be reading slower, not faster than stock.

TimDart. I have a Richmond Full Locker in my '65 Valiant (360, 727, 8 3/4). If you drive it like an open rear around corners you'll have that problem. Just have a heavy foot on the straights. In the instructions I received with mine these very issues were noted. LML (love my locker).

bluemissle. I have an E body housing (70 Cuda) in my garage. I just measured it and it is 56.5 flange to flange. Axles are LBP and it came with a 489 gear case.

Grassy, because the centerline of the axle to centerline of rear u-joint is 2.25" longer in an 8 3/4 than a 7 1/4 that is how much you have to shorten the driveshaft. I did this swap in my Valiant about a year ago. Went from a /6 to a 360-727-8 3/4.

340RT, I junked my B&M cable shifter because of the same problem you are having. My 65 Valiant is now shifted by a Lokar Nostalgia double bend shifter. Works great.

Hello ram250098. A 24" tire turns 835 revolutions per mile. At 60mph with a 3.90 gear gives you approx 3256 rpm. A set of 3.55 = about 2964 at 60mph. Take whatever gear ratio you want and multiply by 835 to see what rpm at 60 mph. Hope this helps.

Crackedback, please enlighten us with the correct measurements. Thanks

1968FromulaS340. Nice reply. Full of all kinds of useful info. Keep it up!

71 Duster 440. I run a Richmond full locker on the street. No big deal. As far as driveability with 4.10 you left out an important part of info. How tall are your tires? I assume fairly tall if it is tubbed. Here's the deal: a 28" tall tire turns approx. 713 revolutions per mile x 4.10 (gear...

orangecrush, 26" tires turn 767 revolutions per mile. 767 x 3.73 (gear ratio) = 2860rpm at 60mph, 3098rpm at 65mph, 3337rpm at 70mph. 27" tires will drop the rpm by approx 100rpm at any given speed in top gear. With this info you can substitute any gear ratio and do the math.

Stimpy29, you left out an important part of the equation. How tall are your tires? Guessing they are around 28" on up go with the 3.55. With all that torque sounds like you are going to have one mean tire shredding machine! P.S. A 28" tire w/3.55 = approx. 2530 rpm @60, 2740 rpm @ 65mph and...

74Dart318, Go to the Phoenix Transmissions' web site. They have the 518 w/ torque conv. as a kit. Floor cutting is involved. What is nice about the 518 is it uses the same linkage as a 727 because it is an electric OD.

All F-body 8.25 specs are 54.340" flange to flange, 44.46" spring perch to perch, 11.69" axle centerline to centerline of rear u-joint. A-body 8.25 is 51.40" flange to flange, 43.02 perch to perch, same axle to rear u. Hope this helps.

4.10 x 803(tire revs per mile) = 3292 rpm @ 60 mph. Kinda high for the street but great for the track. FYI when racing 100 mph= approx. 5486 rpm. You can do the math yourself. Tire revs per mile times any given rear ratio will give you rpm at 60 mph. Hope is helps.