Correct, No Glow plugs. Just starts with compression, glow plugs are only utilized on diesels engine to make starting easier, but I suppose they just never had starting issues. I know the 6BT has glow plugs. The 6BT also had an intake grid heater, and I have seen people adapt this grid heater to the 4BT intake, and basically its a small electric grid heater that heats up the intake air during starting to make starting easier. I have not had to try to start it in the cold yet so we will see, but it also has a block heater on it.
I did not re-gear yet. I plan to go with 3.08s mainly because the engine will not go over 2800 RPM without modification, and the maximum speed this engine can safely achieve is 3200RPM and right now with 3.73s(I think, I have never took the time to look) and 30" tires, the engine is pinned at about 2700 rpm going 70 mph down the highway.
So to compare it to a gasoline engine, imagine driving down the high at 70MPH at 5000RPM...in 5th gear...... your not in the power curve of the engine, and your not running very efficient.
This engine makes its power between 2000-2500 rpm give or take. Therefore my goal is to be right around 2000RPM at 70 mph, where the engine will be most efficient.
And yes, the amount of torque makes up for the low gearing easily, I can pull out from a slow roll in 4th no problem.
Also, with the turbo, you want the gearing to be in sync with when the turbo is building boost. Its hard to explain without driving it and feeling it, but Right now, if I am in 2nd, I can only go like 20 mph, and its not even a load on the engine, so it does not build much boost. The only time it builds significant boost right now is in 5th gear.
I guess the best way to explain it is, go put your jeep in 4lo and try to drive down the highway haha, thats what its like driving my jeep.
So, currently yes it is a Dana 35, I have yet to decide if I just want to put in a Ford 8.8 with 3.08s, or if I want to do dana 44s. The Ford 8.8 is cheap, easy, and most people say pretty strong, but I blew one to pieces with my old Jeep that had a Chevy 350, so I am no longer sold on the idea of an 8.8.
Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago
Ask me about my 4BT Cummins Motor Mounts!!