I'm building a '77 Intl. Terra, built 392, T-19 4 spd, D300, SOA,
full width D60/14 bolt, 4.56's, detroit rear, thinking 36's??

this will be an occasional Daily driver/tow rig,
with an occasional play in the dirt.

what do ya think of mile gear/tire combo??
am I geared to low for a DD/tow rig??
(I can always get the 4:1 for the D300)
OR should I look at an OD auto trans??

What are your thoughts??
Just in the planning stages right now.

I Already have the Terra w/T19/D300 & full width axles (4.56/det. rear) I plan to build the motor next year but I am also considering an OD slush box.

Thoughts/Opinions/what R U running??

Thanx!, Darren Y

Scout, SOA and tow-rig don't go well together. I'd either run stiff (new) springs or invest in some MAJOR swaybars for the rear. Being full width will help a great deal on stability, but with only 118" wheel base, you need all the help you can get.

DO NOT USE A SLUSHBOX.

They suck for towing, suck for wheeling, suck for daily driving, and a built 392 will eat anything short of an Allison for LUNCH!!!




I'm currently building a Terra (77) for similar duty, maybe a little more tow- oriented.

I'm currently running 304/18/20/ 3.54's. (and 30 inch rubber :barf: )

Plan is no susp. lift, extra main leaf (4 corners), 33's or 35's, 38" tubs in back, 1 inch body lift and sawzall front.

4.27's and dual detroits, or detroit front/mini spool back.

BUILT (by John Comer) 392 (I'm dreaming here ;))

T-19 close and 300.

I like the Terra idea but that is a pretty short w/b. As far as the gear v/s tire diameter it depends on the power range of the cam in the 392. I put a new 460 in my f350 and took the 33-12.5s off thinking I will have tons of torque. I ended up pulling hills slower than with the 351m and 33s because of the 4.10 gears. I acctually need the taller tires or higher gears(3.73) to put the rpm range back in the right spot for the speed It hits at. I would assume with 36s if the power range is 2200 to 3000 will work great for max torque at 55 to 60mph.My max torque now ends at 50mph.:( so I will be going with the tires instead of gears.

So would 33-35/4.10's be a better choice than 4.56/36-37??
I guess I'm looking for am rpm ~2500-2700 at hwy speed.
& last for the rear (14 bolt) Gov-Lok or Detroit??

Well I would definitely go detroit, and talk to a shop that installs gears, and they can dial in your gear ratio to tire size to power band for all the stuff you have. I would personally go no larger than the 36 tsl, for sidewall wable problems

detroit locker and swampers:D

Not so sure I'll run swampers, this thing will see more Hwy. miles.
I'm thinking about going with the 4.10's & 35's???
We'll see when I get to that point.

Darren Y.