4 sp trans / rear axle combinations question

[pflaming]

Trans 4 speed.             Axle ratio 3:55

gear 4.                         3:55        1 : 1     Following ratios approximations. How accurate are these numbers? Arranged thus, gear 4 would

gear 3.                         3:75                    would be the crusing gear, this might be a nice towing set up.  Responses welcomed. Maybe even 

gear 2.                         3:90                     start with a 3:42. 

gear 1.                         4:11

[55 Fargo]

Okay here is my vote, towing 4.11s. or 3.90

Cruising level ground areas, 3.55, nice for the highway, and should be no issue taking off in 1st with most transmissions, deleting "bull Low" as it would still be useless with 3.55s.

3.73, nice around town, some hills better and faster acceleration than 3.55s, plays nice with an overdrive too...

I can tell you that 3.23 is okay, but slower to get to speed, might not be so much fun with the smaller engines in the hills and wind...

[55 Fargo]

Okay read your PM, and will answer you on that too.

I get what your trying to say but what do you want to actually find out.

You are entertaining a 4spd, that 1st gear is in the 3.42 range, then 2nd would be around 2.2, 3rd 1.49, then 4th 1:1.

So this is definitely not any of the 4spd truck transmissions with a useless  bull ow 1st gear, thus rendering you a 3spd to work with.

Why don't you supply us with a real gear ratio spec from a real trans you are thinking about.

Towing, I don't care which trans you use, but the rear screw better be lower than 3.55, so yes at least 3.73.

[55 Fargo]

https://www.novak-adapt.com/knowledge/transmissions/manual/t4-t5/

https://www.novak-adapt.com/knowledge/transmissions/manual/t176/

Edited April 12, 2017 by Rockwood

[wayfarer]

The rear gear is only as important as the available torque....... How much 'ya got???

[pflaming]

My engine is a 54, 230 cu in. I will now search and document (1) engine, (2) transmission, (3) tire diameter (4) available axle ratios. Without that information it all is anyone's guess, deferred for further research. Knee replacement next week so ample research time coming. 

[classiccarjack]

Is your Transmission a A833?

[pflaming]

Just now, classiccarjack said:

Is your Transmission a A833?

The numbers are C 38861 side of box, C 89871 on the top. Date 8 24 50.   Engine is P24 * 489925 *  

[55 Fargo]

New Process  420 s most likely what you have not an A 833 modern overdrive 4 spd trans

Edited April 13, 2017 by 55 Fargo Spitfire

[classiccarjack]

4 hours ago, 55 Fargo Spitfire said:

New Process  420 s most likely what you have not an A 833 modern overdrive 4 spd trans

Aha!  For some reason I thought this was a car...    It's a Truck!  My bad.

I have a couple of New Process A420's.  One of them is bound the other is not.  I am planning on putting one in my 1937 1.5 Ton.  I hope that between the 2, I will end up with one outstanding Transmission.

Thank you 55 Fargo Spitfire.  I am no longer confused.

 

 

[classiccarjack]

Where do you find rebuild kits for these transmissions??  

[55 Fargo]

36 minutes ago, classiccarjack said:

Where do you find rebuild kits for these transmissions??  

A833?  http://www.brewersperformance.com/products.asp?cat=271

NP 420 how about Novaks

https://drive.google.com/file/d/0BxzO_Oy1EMLILXpfX2JFR2ppN28/view

Edited April 14, 2017 by 55 Fargo Spitfire

[classiccarjack]

Thank you 55 Fargo Spitfire.

A833's not only Brewers but I also use Jamie for parts at Passon Performance.  I build several A833's every year.

I should have been more specific regarding the A420, that was what I meant.  I will definitely look up Novak's when I finally get a moment to myself around here...  LOL