Ive searched and cannot find a clear answer...

Im running a 360, 727, D44's with 4:56s, D300, and 38" TSL's.

Question is, what is the ideal TC to use for offroad? Im running the stock replacement TC and am constantly on the brakes. I'm wondering if there is a TC of preference.

I see that some are running low stall, high stall, lockup, non lockup...

This is my 3rd tranny and I am conteplating the switch to NP435 if i cant get my 727 work with what im running.

Slushbox gurus please help!!!

Mo

The dana 300 is an excellent case. It is gear driven. They make 4-1 kits for it for under 1000 bucks. If you are grenading the case, unlikely run a NP205 case there is not much stronger than that, but its huge and the ratio sucks. There is also the atlas case, with a wide variety of ratios, and it is fairly strong. A buddy just grenaded the outside case hitting it on a rock though. I tend to like the 300 better, its smaller, gear driven, strong and has a cast case, instead of aluminum.

Ben

Heh,
Sorry I just realized you meant torque converter not transfer case. A lower stall, stock converter is probably best for offroading, keeps the heat down. Put some gears in your D300 and you won't need to ride the brakes.

Ben

I too would like to know which torque converter. I am a wanbee auto guy. It is my understanding that once a torque converter achieves its stall speed then torque multiplication stops. To me this means you probably want a higher stall speed, say around 2000-2200 rpm. But with higher stall speeds come unwanted heat and massive amounts of AT cooling are needed especially in areas with high ambient temps, such as desert areas. So what is the answer?

I here Continental builds near indestructible TC’s. At least that is what a couple of class 8 truck racers told me. Thier TC’s were blowing up all the time and then they tried Continentals and never had anymore problems.

I put a 2000rpm stall on my Nova back in highschool, It was supposed to make it faster like dropping your clutch into gear, but it only stopped the beast form stalling at a complete stop, It had a hand-me-down hot camed engine it needed a higher idle RPM and the 2000RPM stall torque converter did the trick. holding the gass and brake at stop lights is no fun.

Whats the problem?
1. Your crawling and cant stop without putting in neutral?
2. Or you need to gass/brake it at stops to prevent it form stalling.

Id say fix for #1 put it in nutral or give me your low gears.
Fix for #2 get a higher rpm TC.
:D

Hi-stall will give you more heat, but may help keep your engine in the power band and off the brakes. I'm running an Internation motor, which makes plenty of torque down low so I run a stock TC, with about a 1200 stall. I'm running a D300 with 4:1 kit and have no problem stoping or slowing the beast down (4 wheel disks). What is your idle set at? Will the tranny hold first. some later model 727's will still upshift into second even when in first.

My 2 cents, you may want to add additional details as to the problem you are having.

Joe

stock 727 torque converter stall is between 1500-2000 rpm, with most being near 2000.

are you having trouble engine braking down hills? get a manual or get deepass gears. autos aren't really good at compression braking.

lockup is really only something to worry about if you do a lot of highway driving. it locks the torque converter so that the engine output shaft and tranny input shaft are essentially one piece. non-lockup lets the torque converter throw in some slush, usually about 6-10% of your rpms. e.g., expect to be running about 3240 rpm instead of 3000 with a lockup.

if you want low end torque, get an aftermarket converter with a stall between 1200-1500 rpm. no converter is perfectly on the mark though; a converter rated for 1200 could actually stall at 1300 or 1100.

Thanks for all the replies...

But this hit the nail on the head!!!
Originally posted by WillyPete
are you having trouble engine braking down hills? get a manual or get deepass gears. autos aren't really good at compression braking.

Im geared right where i need to be but while decending a hill, the engine wont brake enuf and that is when i have to apply the brakes. I already have kickass 4WDisks that stop on a dime, i would just like the 'manual-like' ability to creep down a slope.

Im planning on installing a manual valve body and lower tranny gears. Later down the road im going to do the 4to1 in the D300.

Ive just read different posts about low rpm TC's and high rpm TC's. I just confused as to which will actually enhance performance offroad. My next try will be an RV TC for the TF727...

The info on the above replies was great, lets see if we have more...

Mo