blueblazes44
1/2 ton status
Don't blame you for not wanting to swap now but I can be on the hunt. My sponsor is a local trans shop and have friends at 2 local yards so good deals can be found if willing to take time and gather over a few months.
Thanks. I'll Have to check ratios with the 208 and what adapter i would need. .
(My wife always doubles my garage estimates).my trans has already been built by the previous owner in 2004-2005? i have a thread on here from when i bought it. it's a full manual reverse valve body. i didn't have any receipts from the tranny build ( i did for the 383 engine, has been since redone) . i think it had some high dollar stuff put in it too. it still works perfect, but i'm sure if i took it somewhere they'd want to freshen it up.
The 203 is 2.0:1 low, the 208 is 2.61:1 low range, a significant difference if you run low range(I assume you do). The 205 is 1.96:1. Not sure if that would help you or not. If you couldn't run 3rd gear before, you definitely could now. For example, at 6000 RPM, 2nd gear with a 203 gives your combo 50 MPH tire speed (without slip), and 3rd gear with a 208 would give you 56 MPH tire speed. (2nd with the 203 is 74 MPH, and 2nd with the 208 is 38 MPH)
Tailshaft removal requires complete dissassemly of the trans pretty much, it's not hard, but it's one of those things where if the trans isn't fresh, you might as well rebuild it because the parts are cheap compared to the time to tear it out and apart. Although if it was fresh, just tearing it down and putting the trans back together without any parts replacement could be done in a 2 hours I would guess, which probably means 4.(My wife always doubles my garage estimates).
You may be better off finding a whole TH400/NP208 assembly. Then you could have it all ready to go ahead of time and swap it in one day on the weekend.
If that's the case just do it youself, you can get the ATSG manual for $25 or so. It's not that bad as long as you keep the stuff in the same order you'll be fine. And tilt the trans on it's side after you remove the center support bolt (under the valve body) It's a lot easier to remove the center support/planetary assembly with it on it's side. Be sure to grab the smaller intermediate shaft (not the hollow sun shaft) and push on the tailshaft at the same time so it doesn't fall apart inside forcing you to figure out how all the torrington bearings and everything fit back in.
. Do you spray the frame and undercarriage before you run? Some folks here use hydro fluid, wd-40 and the likes to keep the mud from caking up during the run.