23 spline all the way

[vova]

Right now i'm running a 4.3L - R151- dual cases with 4.7 gear in the second case.
What do i need to do to change my second case to 23 spline so i'm 23 all theway through?
Will i need to replace the 4.7's

[rEdnECkwHeE1eR]

Isnt the R151 a 23 spline tranny?

[Brandon]

yea, you will..

I am 23 all the way but no 4.7's..

[Chewbacca]

so if i want to get 4.7 gears and be 23 spline all the way i should order the 23 spline 4.7 gearset for the rear case, and a 23 spline output for the front case?  i'm preparing to put my turbo tranny in and need to rip it apart anyway and put a 23 spline input into the front case anyway...

am i correct??

[Chewbacca]

anyone?

[cruzila]

That sounds right. As long as the trans is 23 output and you get the 23 spline coupler for the dual adapter.  

[BigMike]

That's right.

Basically this is how it breaks down:

Transmission > 1st Crawler Input > Crawler Coupler > 2nd T/case Input.

So thats...

23 spline R151F > 23 spline Crawler Input > 23 spline Crawler Coupler > 23 spline Transfercase Input.

If I ever get some $$ and start up a rig, here is what I will do:

Marlin's Heavy Duty L-Series Transmission 21 spline > 4-Speed Transfercase 21 spline Crawler Input > 23 spline Crawler coupler > 23 spline 4.70 transfercase Input.

That would be the strongest setup behind a 21 spline trans.

=============

Vova: How old is your gear set? I think we have a couple of those older gear sets somewhere on a shelf that we would exchange your 21 spline for a 23 spline input. I would have to check with Marlin to see if we have any. I know we have done this in the past for customers at no cost! Just as long as your gear is still in good shape.

Regards,
BigMike

[vova]

Vova: How old is your gear set? I think we have a couple of those older gear sets somewhere on a shelf that we would exchange your 21 spline for a 23 spline input. I would have to check with Marlin to see if we have any. I know we have done this in the past for customers at no cost! Just as long as your gear is still in good shape.

Regards,
BigMike

My 4.7's are about a year or so old.  So if i trade you the 4.7's, i'll need to buy a 23 spline Crawler Coupler and 23 spline Transfercase Input?


Thanks

[Chewbacca]

So if I have a 21 spline setup right now then I will need to also get a 23 spline 'coupler' for my actual adapter?

[BigMike]

oh whoops.

Yeah, you must get a 23 spline coupler as well. Sorry about that.

I am not sure if we would do a direct swap on your setup. Just give Marlin a call and you guys can get it figured out - !

[BigMike]

Isnt the R151 a 23 spline tranny?

That and the R150F (V6) 5spd trans are the only 23-spline trans.

The differences is that the R151F uses a 4.34:1 First gear as compared to a 3.83:1 First on the R150F and the R150F uses a different rear tail shaft housing that mates to a chain drive transfercase rather than a gear drive case.

FYI, The R transmissions are still used today and hold up exceptionally well behind full size V6 T100s and V6 Tacomas with TRD Superchargers!