Muncie M20 into a 4wd application?

DHR Darren · Dec 9, 2015

I remember back in the 80's you would see the old flat fenders with a sbc/car 4 speed combo quite often. Does anyone remember that setup and what was needed & what transfer case was used?

Corey Y · Dec 9, 2015

Novak or Advanced Adapter and a Dana 18 or 20.

http://m.ebay.com/itm/Muncie-4-spee...ana-18-20-transfer-case-adapter-/360661228535

Jay W · Dec 9, 2015

I might know of one connected to a Dana 20 that is for sale.

DHR Darren · Dec 9, 2015

Jay W said:
I might know of one connected to a Dana 20 that is for sale.

I would be interested.

pokey · Dec 9, 2015

Watch out on the homemade ones lots of them used a welded mainshaft which was fine for the power back then but questionable nowadays.

DHR Darren · Dec 9, 2015

The homemade adapter?

It is getting an aluminum headed 383. It dyno'd at 446hp@6600 & 488ft.lb.@ 5100.

pokey · Dec 9, 2015

DHR Darren said:
The homemade adapter?

It is getting an aluminum headed 383. It dyno'd at 446hp@6600 & 488ft.lb.@ 5100.

yep. people used an aluminum adapter for another application (cant remember which one ) and then made their own output shaft by welding two shafts together. Had one in my first flatty with a 225 oddfire but replaced it with a truck 4 speed for the lower gearing

DHR Darren · Dec 9, 2015

I am thinking that the 2.20 1st, low range of a 20 or 18 & 5.29-5.38s
Should do ok on 39.5s

Jay W · Dec 10, 2015

If you plan to offroad this at all that 1st gear would suck. My T18 with 3.09 second gear is not always enough. If you plan to race it then it should be great.

skinny_pedal · Dec 10, 2015

DHR Darren said:
The homemade adapter?

It is getting an aluminum headed 383. It dyno'd at 446hp@6600 & 488ft.lb.@ 5100.

That should be quite fun in a little flatty

zukkev · Dec 10, 2015

DHR Darren said:
I am thinking that the 2.20 1st, low range of a 20 or 18 & 5.29-5.38s
Should do ok on 39.5s

Yer gonna want more gearing...especially with that motor...

DHR Darren · Dec 10, 2015

That's where I am at a crossroads, it will be a multi-purpose rig. Street, trail, dunes, snow.

Only reason I am thinking about the M20 is I have a new one on the shelf.

CHOP SHOP · Dec 10, 2015

400+ hp and v8 weight are gonna make that toyota axle choice kinda bammer. The 39.5s are gonna seal the deal!

Bent housings and toasted R&Ps are in your future.

ain'tstuckjustresting · Dec 10, 2015

Yep, gonna have to treat it with kid gloves. That much power & traction is gonna strip a 8" 5.29 3rd every run.

DHR Darren · Dec 10, 2015

Ya, kid gloves are not my forte'.
I'd best just do a 40 spline 9".

Corey Y · Dec 10, 2015

DHR Darren said:
Ya, kid gloves are not my forte'.
I'd best just do a 40 spline 9".

With a 10" ring gear.

DHR Darren · Dec 10, 2015

I want to build the 3B version of this.
https://www.youtube.com/watch?v=nENygx0CTRs
https://www.youtube.com/watch?v=JcdYxMRgCro

superglock · Dec 11, 2015

I know a guy with a flatty with a healthy 383 and the same setup you are talking about and 37s. He ended going to 5.89 in the rear 44 because the 1st gear sucked. Still not the best but he uses it as a hot rod not a wheeler and has been threw at least one gear set in the 44. The people on here are giving you good info think about listening.

DHR Darren · Dec 11, 2015

I agree, lots of good info in here.
What transmission would you suggest for performance use in all applications?
Dune, street, snow & moderate trail use?

hlb3 · Dec 11, 2015

An SM465 might be an decent all around option, you have the 6.5:1 first gear for trail use, 2nd gear is somewhere around 3.5:1, which is still lower than the M20.