Will 6L80e fit in an FJ40 without major sheet metal mods (1 Viewer)

[BigWalker]

background: i have a 1972 FJ40 with 4 BT and 700R4. Planning to install a R2.8 and would like to use a 6L80e with atlas 2spd. I could use a 4L60e but prefer to change the bellhousing instaed of using an interim adapter.
I am not concerned with length since it is essentially the same as the 700R4

What I dont know is comparative diameter to the 700R4 and will it clear the tunnel without major sheetmetal mods
Anybody with experience in the tranny swap

 

[matzell]

background: i have a 1972 FJ40 with 4 BT and 700R4. Planning to install a R2.8 and would like to use a 6L80e with atlas 2spd. I could use a 4L60e but prefer to change the bellhousing instaed of using an interim adapter.
I am not concerned with length since it is essentially the same as the 700R4

What I dont know is comparative diameter to the 700R4 and will it clear the tunnel without major sheetmetal mods
Anybody with experience in the tranny swap

It is huge! I have one in my race car behind a 6.2L. It is a lot taller than a 700r4. about 100lbs heavier too. If you do it, talk with Zero Gravity performance out of AZ. He can set you up with tunes and tap shift.

 

[Mieser]

The 6L80 isn't much taller from centerline to the top, but wholy cow is it a lot deeper from the centerline to the bottom. It is about like an old granny 4 speed manual transmission with a big old belly....

 

[BigWalker]

The 6L80 isn't much taller from centerline to the top, but wholy cow is it a lot deeper from the centerline to the bottom. It is about like an old granny 4 speed manual transmission with a big old belly....

Thanks for that. I now have this image of my LC looking like a pot belly pig I will get that measurement today. My 700r4 pan is about 2” below the frame rail currently.

 

[BigWalker]

Measurements:
6L80e centerline to botton of pan 9 1/2”
700R4 centerline to bottom of pan 7 1/2”
I can change the pan on the 6L80 and gain an inch to 8 1/2”
Might be able to push it up an gain an inch but without the R2.8 its a maybe
The 6 speed 6L80 with 5-6 being a double overdrive will allow lower gear ration and still maintain crusie rpm
Will make the final decision when the engine gets here

 

[Mieser]

Why not the dodge 8 speed that Axis is supporting?

 

[BigWalker]

Why not the dodge 8 speed that Axis is supporting?

No thanks
Limited transfer case adapters, Reliability issues, cost, after sale support immediately come to mind.
I would drop in a 4L65 or 4L70 before that ever happens, also current transfer case is now a split case instead of atlas.
Thanks

 

[Mieser]

No thanks
Limited transfer case adapters, Reliability issues, cost, after sale support immediately come to mind.
I would drop in a 4L65 or 4L70 before that ever happens, also current transfer case is now a split case instead of atlas.
Thanks

Just throwing it out there. Axis seems to have it pretty nailed down with a lot of support.
The 6L80 isn't that well supported in the market really either?

 

[Gotta be Geared]

I have the 6l80 in my personal 40 and it fits well. I had to notch out the under seat gas tank area because I clocked the np205 up a bit. I really enjoy the 6l80, the low first is great and the support for tuning is continually growing.

 

[BigWalker]

I have the 6l80 in my personal 40 and it fits well. I had to notch out the under seat gas tank area because I clocked the np205 up a bit. I really enjoy the 6l80, the low first is great and the support for tuning is continually growing.

Thanks

 

[Mieser]

If you are going to go to all the trouble of a big engine and trans swap, why not just rebuild the tunnel and make the belly flat?

 

[BigWalker]

The thought of tearing up and redoing
is more the i am willing to do. I will live with
a coiple inches below frame rails and a new skid plate

 

[NeVrDun]

I have the 6l80 in my personal 40 and it fits well. I had to notch out the under seat gas tank area because I clocked the np205 up a bit. I really enjoy the 6l80, the low first is great and the support for tuning is continually growing.

My 1970 40 is setup with a 427 bbc w/ th400 3 spd w/ an AdvAdapter plate connecting the original t-case.
Will the 6L80E fit behind a 5.3 Vortec (LMG) so that I can reused the t-case?
Pictures?

 

[pjohnson]

You'll need a different adapter for the 6L80e to the transfer case.
Check Advance Adapters website.

AdvanceAdapters.com | Engine & Transmission Conversion Adapters - Advance Adapters

Advance Adapters Engine and Transmission Adapters & Conversion parts.

www.advanceadapters.com

 

[cencalfj40]

I have the 6l80 in my personal 40 and it fits well. I had to notch out the under seat gas tank area because I clocked the np205 up a bit. I really enjoy the 6l80, the low first is great and the support for tuning is continually growing.

I know this is a old thread, but ls3 and 6l80 combos are cheaper that 4l65 or 4l70 , do you still like your 6l80 in your fj40? thank you, rob,