D20 Low Range = 2.03:1nc wagoneer wrote:I will be running 31-32's on the j20. I have a place I'm town that I can get adaptors made pretty cheap, (or next to nothing if I can do it in shop class). I don't want to switch out the d20 for an np205 for two reasons 1.it will hang below the frame and 2.from my experience with one in my dads f350 it doesn't have enough of a gear reduction for the terrain and things I'll be using it for. I have heard about ranger overdrives being used on our jeeps but they don't list a jeep t18 overdrive. Can the ford overdrive unit be adapted? If I could put on a ranger overdrive later on I would really like to go with a t18. It will only see 55-65 TOPS and VERY RARELY until I graduate (planning eci 2015 or 2016 and ouray 2017) and most driving till I go cross country will be 35-50 mph around the back roads.
It's a 3sp with any engine unless you are hauling or towing. With my old Cherokee, I used 1st offroad, and when towing. Or if I just had to drive real slow.rocklaurence wrote:Go with the NV4500 as the T18 with granny LOW in a diesel equals a 3 speed w/o over drive. Unless, your rock crawling your J20
If you don't have the lower first gear version, doesn't that mean you have a chrysler NV4500? I know the fluid that they use is fine. But I agree newer transmissions are very picky. The NSG375 in my JK is EXTREMELY picky about fluid types. So much so that it literally will not shift into second if you use the wrong fluid.Blake wrote:I've been running a GM NV4500 in the honcho for the past 4 years. It's not the one with the super low first gear, but it's still a pretty low first gear. I take off in first about half the time and second the other half. 5:38's and 42's and tons.
That 5th gear will help more than you think. It opens up the possibility of comfortably driving it long distances. I know you aren't planning on doing that, but ya never know.
An NV4500 shifts WAY, WAY, WAY better than any T18. Much faster and smoother. Although the 4500 is no sports car tranny either.
When you do, you MUST get the fluid from a chevy/gmc dealer. No other type of oil is correct. Nothing. Not even the amsoil synthetic that says it's for an nv4500. As me how I know
Only the pre 94 gm nv4500's had the super low first gear.Stuka wrote:If you don't have the lower first gear version, doesn't that mean you have a chrysler NV4500? I know the fluid that they use is fine. But I agree newer transmissions are very picky. The NSG375 in my JK is EXTREMELY picky about fluid types. So much so that it literally will not shift into second if you use the wrong fluid.Blake wrote:I've been running a GM NV4500 in the honcho for the past 4 years. It's not the one with the super low first gear, but it's still a pretty low first gear. I take off in first about half the time and second the other half. 5:38's and 42's and tons.
That 5th gear will help more than you think. It opens up the possibility of comfortably driving it long distances. I know you aren't planning on doing that, but ya never know.
An NV4500 shifts WAY, WAY, WAY better than any T18. Much faster and smoother. Although the 4500 is no sports car tranny either.
When you do, you MUST get the fluid from a chevy/gmc dealer. No other type of oil is correct. Nothing. Not even the amsoil synthetic that says it's for an nv4500. As me how I know
You're only going to like that for about 20 minutes. It's going to make your rig absolutely miserable to drive. I thought a T18 would be super awesome at one point too...then I had one...then I hated to drive my truck. It's downright painful to drive around. As mentioned the shifting actions totally sucks. It was literally designed as a dump truck transmission (we had one in a 70s F350 dump truck when I did landscaping). It is NOT a great decision for a trans.nc wagoneer wrote:And I kinda like the idea of 8 gears to go through not counting low range in the transfer case
x2 I've had a 6.2 sm465 in a k30 and it was not a very pleasant combination. You have to remember that you'll basically be using a sm465 as a 3 speed with a horrible gear spread for a low revving 6.2. Take your time and save up some cash and find a nv4500. A nv3550 would work also as long as your not going to turbo and pull heavy loads.Cecil14 wrote: This is one place you really don't want to skimp on cash. Best bet is to find a couple rigs to test drive. Find someone with either trans that's willing to let you take a cruise around the block, that's the easiest way to get a feel for what you're getting into.