Driveline help

[cruisermatt]

If you give a mouse a cookie...

I'm putting a NV4500/203/splitcase combo in my FJ62, behind the 3FE.
The gear train will be long, equivalent in length to if one had the stock a440f automatic and put a 203 kit in.

I'm just eyeballing it right now but I think I'm going to have to go to a DC rear driveshaft because of the angle and shortness.

Here's the problem, I have an FZJ80 rear axle swapped in (non-e-locked) which is more centered (2" more I believe?) then the stock 60 offset. That's not going to work with the DC driveshaft.

So here's what I'm thinking: Since I need to cut the perches anyway, should I get an FJ60 full-floating short-side shaft and narrow my housing to use that? Would that put my diff offset back into the right place?

I'm at pretty much stock suspension height right now (SUA) So I figure I can get away with a standard driveshaft and the offset for tooling around on the road but looking at SOA'ing the rear in the long term so I need to make a plan. Any insight?

 

[Mace]

Run the calcs again, I doubt that you will need a DC rear DS. I do not have one in my 60 with a Ferd auto, 203 and the split tcase. (I know the ford motor is shorter but)

I bet your rear DS will easily be long enough.

 

[pjohnson]

He's going to want a glass of milk...

If the 80 rear is already there, why are you cutting the perches off anyway?

I would stay full width, mucho better.

 

[cruisermatt]

@Mace - thanks for the confidence. How far forwards is your engine? My thoughts were that any 60's with autos and doublers had V8's or I4's and had their motors forwards that 7-8" of missing cylinders.

@pjohnson because although it's diff is offset it is more centered then 60 or 40 axles, meaning I couldn't run a DC driveshaft.

 

[cruisermatt]

@Mace could you also say whether or not using the 60 FF short-side to narrow the 80 axle (if I have to go that route) is a good strategy?

 

[Mace]

I set my motor fairly far back to give more room between the fan and the radiator. So I doubt you have 7 or 8" of difference. more like 4" ish.

If you are going to that extent.. I'd just do alloy custom length shafts instead of a factory FJ60 FF short side (same length as a FJ40 FF short side).

I still think you are good.. Total adapter length should be in the 8" range for the 203. say 20" total for the adapters and NV4500.

 

[pjohnson]

I see, you were cutting the perches off because you plan to narrow the 80 rear, got it.

I edited my post and then re-read the thread...

My understanding is the slight mis-alignment front to rear would not be a problem with a DC shaft.

 

[Mace]

^^^^ agreed

 

[Gumby]

I just run the full width 80 rear. makes parts easy to find.

 

[LAMBCRUSHER]

Having cut 3 1/8" out of my passenger side fzj80 rear, I'd say leave it longer. Also, if you narrowed enough to fit an fj60 right side rear FF shaft, you'd be much more narrow than you think- the drivers side would have to extend as well to keep track...again, as others have stated, leave the width, you're going to need it when you put on larger deeper wheels....

 

[cruisermatt]

@Gumby I know your 55 is chopped, but is your WB shortened? You run auto/203/splitcase no issues?

@Mace Yes 203 with the rear adapter is about 7.5-8". The NV4500 is actually a pretty long trans though, 18.5" front face to tailhousing. Plus 3/4" front adapter to bolt it to the 1F bellhousing.

Either way I was a dumbass and saw an a440f was 27", and my NV4500/203 plus the adapters was 27", but I didn't count that the A440f includes the bellhousing.

 

[Gumby]

My wheelbase is stock. I took 22" out from behind the rear wheel below the body line and from the rear door above it. I have lots of rear driveshaft

 

[bugsnbikes]

i havent done the math but what about narrowing it to use two short side shafts for oem ease.....and spacing out to 60 width via spacers and/or backspacing?

 

[Cruiserdrew]

You are worried about nothing. Get the vertical angles correct between the t-case and the axle flange and it will be fine. Do not narrow your axle. In the end, you'll want the width.

 

[cruisermatt]

Thanks all. Going to mockup with bare engine block and empty gearbox cases and see what it looks like.

The stock 62 crossmember sits perfectly right below the NV4500 tailhousing (where the mount is), unfortunately I might have the front driveshaft going through there. Carrier bearing?

 

[Gumby]

Full width 80 axle. spacers on stock 55 front.

 

[Mace]

I run a stock toyota 2 piece rear DS with the Carrier bearing in my 60 (and my 40 actually)

They work well, but don't balance as well at over 55 mph.

The carrier bearings on the Toyota DS's don't normall wear out, but the carrier does.
So I used this in it's place.

Hendrix Motorsports Billet Aluminum Carrier Bearing Support for Toyota

 

[Chris Wilcox]

I narrowed my rear 80 axle. It is a lot of work. I'd recommend full width unless you have overwhelming reasons to cut it. I don't know of any custom shafts that have the seal surface so you have to deal with that too. Mock it up and check you u-joint angles at both ends. If the diff end is within spec (google it to find charts of angle vs rpm allowed) you certainly could leave it a bit offset.

Longfield rear axleshaft seal???? HELP

 

[cruisermatt]

I run a stock toyota 2 piece rear DS with the Carrier bearing in my 60 (and my 40 actually)

They work well, but don't balance as well at over 55 mph.

The carrier bearings on the Toyota DS's don't normall wear out, but the carrier does.
So I used this in it's place.

Hendrix Motorsports Billet Aluminum Carrier Bearing Support for Toyota

That's sweet! Front, right? Any pictures of it under your 60?

 

[cruisermatt]

I narrowed my rear 80 axle. It is a lot of work. I'd recommend full width unless you have overwhelming reasons to cut it. I don't know of any custom shafts that have the seal surface so you have to deal with that too. Mock it up and check you u-joint angles at both ends. If the diff end is within spec (google it to find charts of angle vs rpm allowed) you certainly could leave it a bit offset.

Longfield rear axleshaft seal???? HELP

Thanks for the input.