Transmisions - Ford Truck Enthusiasts Forums

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Other Ford Engines > Flathead V8 & Flathead 6
Log In 


LinkBack Thread Tools Search this Thread
Old 03-06-2003, 03:21 PM
41Clay's Avatar
41Clay 41Clay is offline
Elder User
Join Date: Sep 2002
Location: Pine Bluff, AR
Posts: 948
41Clay is starting off with a positive reputation.

I have a '41 one ton with the 4 speed heavy duty tranny. I'm considering looking up one of the 5 speed kits for this thing, but I don't want to get one if this is good enough. The truck has an open drive so converting that part is no problem, and I don't mind "double clutching" as I heard people call it. The thing won't be driven all the time, but I still want something that will be good for stop and go traffic and at least be able to get up to 70mph without too high of an rpm. The rear gear will be changed, but before I'm set on that I'm going to paly around with some numbers.

So, can anyone tell me the ratios of each of the gears? And would this be ok for this purpose?

And while I'm at it I might as well ask for the ratios of two trannys sitting around in my yard, they are both 3-speeds for an 8ba. One is a column shift and the other is a top loader (don't think that is much help). Thanks!

Reply With Quote
Old 03-06-2003, 10:39 PM
mtflat mtflat is offline
Post Fiend
Join Date: Oct 1999
Location: Kalispell, MT
Posts: 5,298
mtflat has a good reputation on FTE.mtflat has a good reputation on FTE.mtflat has a good reputation on FTE.

This info is only general in accuracy but should give you a close guess. The 8BA car trannies will be close in ratio to the light truck tranny.

In the trucks (top loader and column shift were very similar),
1st gear is around 2.8:1
2nd gear is around 1.60:1 and of course
3rd is 1:1. Reverse is 3.63:1

Since Henry didn't change things much, my gear info for the 48-52's should also be fairly close.

The 4spd trannies in the one tons - all spur gears - were as follows:
1st gear 6.4:1
2nd gear 3.09:1
3rd gear 1.69:1
4th gear 1:1
Reverse 7.82:1

The rearend will be a greater limiting factor. Again, 48-52 one tons had rear ratios of 5.83 and 5.14. If you have a tag on the differential look for 35/6 or 36/7.

With a 1:1 final tranny drive my 48 F1 is turning about 2500 rpms at 65 mph with a 3.50 rear end. If you do have a 5.++ setup plan on top speed of about 50 or lower unless you change third members.
Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
1951-52 Air Deflector Holes 41Clay 1948 - 1956 F1, F100 & Larger F-Series Trucks 8 11-19-2009 10:16 AM
setting the carburator 41Clay FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428) 1 07-30-2003 05:20 AM
8-N grill for a '41 41Clay 1947 and Older Ford Trucks 0 04-22-2003 12:44 AM
Vent windows or not 41Clay 1948 - 1956 F1, F100 & Larger F-Series Trucks 19 03-30-2003 04:57 PM
shifting 41Clay General NON-Automotive Conversation 9 03-28-2003 11:37 PM

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Other Ford Engines > Flathead V8 & Flathead 6

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

All times are GMT -5. The time now is 11:02 AM.


Advertising - Terms of Use - Privacy Statement - Terms of Service - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup