ZF 5 speed question

Reply Subscribe

Thread Tools

Search this Thread

Dec 21, 2013 | 05:07 PM

97puller

Thread Starter

Senior User

Joined: Apr 2010

Posts: 227

Likes: 1

ZF 5 speed question

Is it possible to swap the gears from an the close ratio S5-42 into a wide ratio S5-47? I do some truck pulling and need the faster 2nd gear.

Dec 22, 2013 | 01:05 PM

EPNCSU2006

Lead Driver

Joined: Nov 2002

Posts: 9,558

Likes: 45

From: Concord, NC

I think that it might be possible to alter the ratios some if you can disassemble the countershaft and press (shrink-fit) new gears on the countershaft to go along with different gears on the mainshaft. I don't think you will be able to swap the whole gearset because in addition to having a different tooth count on the input gear, the pilot and clutch spline area is also different between gas and diesel versions.

Dec 22, 2013 | 02:55 PM

Diesel_Brad

Fleet Owner

Joined: May 2009

Posts: 21,437

Likes: 76

From: Gilbert, PA

Quote:

Originally Posted by 97puller

Is it possible to swap the gears from an the close ratio S5-42 into a wide ratio S5-47? I do some truck pulling and need the faster 2nd gear.

I am assuming you are talking diesel?

If so and you have a s42 to swap gears sets from, just use the whole trans

Dec 22, 2013 | 04:37 PM

97puller

Thread Starter

Senior User

Joined: Apr 2010

Posts: 227

Likes: 1

i have 460 gas truck. the 2.37 2nd gear from the close ratio diesle trans would put my final ratio right about where i need it.

Dec 22, 2013 | 09:06 PM

Diesel_Brad

Fleet Owner

Joined: May 2009

Posts: 21,437

Likes: 76

From: Gilbert, PA

O. NO you can NOT mix and match gears. you can swap ALL the gears, but not individual ones

Dec 22, 2013 | 11:12 PM

Macrobb

Postmaster

Joined: Dec 2011

Posts: 3,860

Likes: 7

IIRC, the bellhousing on the 7.3 idi and 460s was the same, so you could bolt one transmission up to the other... though, I think some bolt holes don't exist in one side or another, so you might have to do some drilling/tapping.