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Transmission, Rear End... Talk & Q&A! Tranny, rear end, drivetrain related stuff... shift it... grind it... pop da clutch!

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Old 09-09-2021, 01:33 PM
Oldboy Oldboy is offline
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Join Date: Aug 2013
Location: Pine bush, ny
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Default Transmission choices

Hello,
I am in the process of enjoying a 46 Plymouth rat built several years ago.
At one time I swapped the 3.0:1 rear for its current 3.55:1 .
Running a Tci turbo 400, powered by a mild 10:1, Ď58 Chrysler Hemi.
Car goes well, really burns the tires. On the highway itís just crummy, really got to spin the motor just to go 60 mph.
So Now Iím wanting for a manual transmission, 5 speed would be good, 6 speed could be awesome.
Are there any salvage yard later model choices?
A Tremec would be great and handle the abuse, but itís 3600 bucks without the bell housing , clutch, pp, and slave cylinder. (Or adapter for that matter)
Any solid choices, or am I going back to 3.0:1?
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Old 09-09-2021, 03:17 PM
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05snopro440 05snopro440 is offline
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What's your tire diameter? Something doesn't add up to be having to "really got to spin the motor just to go 60 mph."

A 3:55 gear with a 3 speed and a 24" diameter tire would spin almost 3,000 RPM at 60MPH. Anything more normal like a 26 or 28" diameter tire would have you at a much more reasonable RPM. I'm running 31" tall tires with a 3.42 and a TH400 and do long highway trips.

If you want to switch to a manual that's fine, but you may want to examine the whole setup you're running.
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Old 09-10-2021, 04:41 AM
Oldboy Oldboy is offline
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Hello,
Going to check height of tire later. 15 ď rim but that doesnít say much. Will check sidewall.
I will run car at 65 mph and report back later. Thanks
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Old 09-10-2021, 07:37 AM
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05snopro440 05snopro440 is offline
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Something a lot of people don't consider when changing transmissions is the RPM range of the engine components. Specifically, your camshaft specs. If your camshaft has an RPM range above where you would run at speed with an overdrive, you can end up with your engine lugging and being inefficient and unhappy going down the road.
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My 455 Buick powered '46 GMC Build Thread

My '46 GMC on Photobucket
---------------------------------------------------------------
When you don't know what you're doing, it's best to do it quickly.

And when Iím gone, you can call me foolish but hopefully not boring. I will have lived.

The more I learn about women, the more I like my car.
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Old 09-10-2021, 08:00 AM
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Old Iron Old Iron is online now
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I can tell from building the 63 Nova, I just got done with, that a Tremmec TR6060 is a really big tranny. I've heard the T56 tranny is smaller but, cannot confirm that personally.
snopro is right on the rpm needing to be in the efficiency range.
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