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  #16  
Old 08-14-2020, 01:19 PM
t walgamuth's Avatar
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31:10 I believe..... The one I want is 31:9.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #17  
Old 08-15-2020, 06:20 PM
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Easter 2021came early :)
 
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Quote:
Originally Posted by t walgamuth View Post
31:10 I believe..... The one I want is 31:9.
I get it. Since you said 3.1 instead of 3.10 I figured 3:1. I doubt a 31:9 would be it to get your desired 3:44, because the pinion would have to be smaller or the ring larger dia .... err something. But if you are going with an entirely different housing ....
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  #18  
Old 08-15-2020, 08:10 PM
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Quote:
Originally Posted by INSIDIOUS View Post
I get it. Since you said 3.1 instead of 3.10 I figured 3:1. I doubt a 31:9 would be it to get your desired 3:44, because the pinion would have to be smaller or the ring larger dia .... err something. But if you are going with an entirely different housing ....

You change the ring and pinion as a set. The ratio is determined by the number of teeth, not the diameters. The question is what is available for this particular diff.
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  #19  
Old 08-15-2020, 10:03 PM
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The two ratios go in the same housing.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #20  
Old 08-15-2020, 11:08 PM
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Post Crown Wheel & Pinion

I stopped by an old VW Parts /enthusiast / nutter buddy to - day, we settled into chairs under the leafy tree over his private air cooled VW junkyard and began chatting .

He's a parts guy with more old books than I ever remember , I'm a VW Mechanic who assembled many cars out of parts .

Anyways, we had a long and interesting chat about VW transxales and ring gears & ratios...

*IF* your race car has a VW R & P you're in fine shape, you just need to make sure and begin the search .

FWIW, old Porsche 356's used the same VW R & P, the new ones out of Mexico are nitrided to make them stronger .

Back in the 1960's Hot Rods didn't worry so much about proper tooth contact because they'd swap gears a lot trying to find that 'perfect' ratio and unless you pre loaded the tooth contact it'd last a long time if noisily before going kaput .
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1982 240D stripper 393,000 miles
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  #21  
Old 08-15-2020, 11:34 PM
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Post Ratios Vs. Gearsets

No;

Only one ratio, two gears .

Divide the number of teeth on each gear to get the final ratio .
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-Nate
1982 240D stripper 393,000 miles
1984 300CD KEEPER ! 481,XXX miles
1984 Euro 300TD Fully optioned SWMBO's
1974 350SLC 4 speed SOLD & missed
Kooky Kommie Ural Motocycles (3)
BMW Moto R60/6 Barn Find, 8,000miles
1959 VW #113 DeLuxe Beetle, 36hp engine, stock
Junk, Rust, Arthritis, Crushed Spine,Broken Neck, Back & arm, lots of screws, pins & plates .
Memories, Peace Of Mind
facts & reality don't change because you can't handle them
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  #22  
Old 08-16-2020, 11:32 PM
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How to tell if it is a vw r and p? Would it have a vw part number on it? Seems like yes.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #23  
Old 08-17-2020, 09:40 AM
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Post

Usually but not always because aftermarket manufacturers don't always use the VW part #'s .

If you can post some pics of it that'd help, I'm thinking you only have the one rear end and don't want to take it apart and down the car....? .

Is it an axle or a transaxle ? .
__________________
-Nate
1982 240D stripper 393,000 miles
1984 300CD KEEPER ! 481,XXX miles
1984 Euro 300TD Fully optioned SWMBO's
1974 350SLC 4 speed SOLD & missed
Kooky Kommie Ural Motocycles (3)
BMW Moto R60/6 Barn Find, 8,000miles
1959 VW #113 DeLuxe Beetle, 36hp engine, stock
Junk, Rust, Arthritis, Crushed Spine,Broken Neck, Back & arm, lots of screws, pins & plates .
Memories, Peace Of Mind
facts & reality don't change because you can't handle them
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  #24  
Old 08-17-2020, 11:45 AM
t walgamuth's Avatar
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transaxle.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #25  
Old 08-17-2020, 01:11 PM
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Post Parts Sourcing

O.K., 4 or 5 speed, what raised, casted in numbers are on the out side of it ?

Post pictures and I'll see what I can find .
__________________
-Nate
1982 240D stripper 393,000 miles
1984 300CD KEEPER ! 481,XXX miles
1984 Euro 300TD Fully optioned SWMBO's
1974 350SLC 4 speed SOLD & missed
Kooky Kommie Ural Motocycles (3)
BMW Moto R60/6 Barn Find, 8,000miles
1959 VW #113 DeLuxe Beetle, 36hp engine, stock
Junk, Rust, Arthritis, Crushed Spine,Broken Neck, Back & arm, lots of screws, pins & plates .
Memories, Peace Of Mind
facts & reality don't change because you can't handle them
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  #26  
Old 08-17-2020, 01:28 PM
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The transmission is hewland.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #27  
Old 08-17-2020, 05:31 PM
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Hewland FTR-200:

http://www.willrace.com/Technical-Documents/Gearbox-Manuals/Hewland-FTR-Manual.pdf

You might try Summit or Pegasus, but I think you'll need to contact Hewland in the UK for reliable tech support and parts.
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  #28  
Old 08-17-2020, 05:32 PM
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BTW, aren't the ratios fixed by the FF spec?
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  #29  
Old 08-17-2020, 06:17 PM
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Location: Sunny So. Cal. !
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Post Hewland Racing Transaxle

Wow~ that's a serious box there, full crasher, I bet it gets noisy .

I don't think you'll find any VW R & P sets with anything near those ratios ! .

8 bolt ring gear I see .

I'm sure you're on other forums that will tell you the skinny about this box, it looks nice, might be a kinda-sorta copy of someone else's ? .

I bee there are specific internal BMW parts used .

I learned how to drive on crash boxes, they all said I had "happy feet" because I had no problems double clutching .

We're going to need links to video of you tearing it up in this car .
__________________
-Nate
1982 240D stripper 393,000 miles
1984 300CD KEEPER ! 481,XXX miles
1984 Euro 300TD Fully optioned SWMBO's
1974 350SLC 4 speed SOLD & missed
Kooky Kommie Ural Motocycles (3)
BMW Moto R60/6 Barn Find, 8,000miles
1959 VW #113 DeLuxe Beetle, 36hp engine, stock
Junk, Rust, Arthritis, Crushed Spine,Broken Neck, Back & arm, lots of screws, pins & plates .
Memories, Peace Of Mind
facts & reality don't change because you can't handle them
Reply With Quote
  #30  
Old 08-17-2020, 06:50 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 37,346
I learned on a 59 Rambler straight crash.

This is a dog tranny which is not crash and does not require use of the clutch once you are underway. you can shift as quickly as you can imagine.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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