FM146 or better?

BronKitis · Aug 16, 2010

I was traveling down the freeway in my BII and all the sudden 5th gear turned into nuetral. Had nothing but 4th... I have no idea what happened but it wasn't fun! So, my question is what should I do? Should I just slap another 146 in it, go the M5OD route or...? Budget, as always, is tight so modifications to tcase, driveshafts (no too hard) mounts, clutch, etc. may end up being the determining factor... I'm running 32's now, but would like to run 33"s and a 4.0 one day. We'll see... Thanks for the help.

AJ

4x4junkie · Aug 17, 2010

The M5OD is a direct swap for the FM146. I wouldn't hesitate to put a M5OD in it.

adsm08 · Aug 17, 2010

Well, it sounds like you lost the counter shaft.

The M5 swap is far from hard if you already have a 146. They are the same length, so the shafts and mounts are the same. T-case needs no mods, and the clutch is determined by the engine, not the trans on these vehicles.

Hope that helps make your decision.

BronKitis · Aug 18, 2010

That's good news to hear! Is the M50D same ratios? Tougher than a 146? Thanks

4x4junkie · Aug 18, 2010

Very similar ratios if you get a 2.9L version.

The 4.0L version (more common) has taller ratios in 1st, 2nd & 3rd.
You can however swap the internals from any other non-4.0L M5OD-R1 into a 4.0L case and have what would be the same thing as a 2.9L M5OD.

adsm08 · Aug 18, 2010

I'm running a 4.0 M5 behind my 2.9. The only time I can really tell is in 5th. But my 2.9 is a bit sickly too.

FM146 or better?

BronKitis

15+ Year Member

4x4junkie

Forum Staff Member

adsm08

Senior Master Grease Monkey

BronKitis

15+ Year Member

4x4junkie

Forum Staff Member

adsm08

Senior Master Grease Monkey

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