Sounds like you and they are on the right track, but, you have to remind them this is NOT a 2000 lb race car with considerably low TQ and a high stall converter. They MUST take this into account or you will just smoke their race car builds easily.
Be sure to tell them you will be putting 1000 ft\lbs of TQ thru the trans at 1600-1800 roms, per your build specs. That puts a different spin on things. The front band (2nd gear) must hold that with the TC locked, as will the diretc clutches need to hold it. The only way to do it is good material, more surface area and more pressure at low rpms. On the way they MUST address the forward clutch pack. This gets forgotten too often in a diesel and you will end up welding the clutch pack on a boosted launch or low rpm full power runs.
As many clutches as possible with as much pressure as possible then you have a problem with the OE clutch pistons warping and sealing. Billet pistons in the direct and forward clutch packs are almost mandatory if you are gonna twist it hard.
Make sure the TC builders understand how a diesel makes power and where or you will end up with a sub standard product. You want as low stall as possible with as much efficiency as possible to make it work correctly. The must do some custom stator work or you loose too much at high throttle and transition form fluid coupling to lockup on a triple is VIOLENT and will break things.
The truth is if you don't spend at least $1000 on the TC alone you will have a weak link and transmission killer at a critical juncture point. Gasser TC's are only going to work in race type vehicles that weight much less. You have a 7k box car to accelerate and that takes a different approach front front to back on the trans.
You will have to address OD clutch pack also under high power. Once you have the trans putting the power down you will want to get into OD on a timely basis to load the engine and make the speed\ET. The stock OD setup won't hold, it needs more clutches than look at the OD pinion and you will want to exventually spring for thta $400 steel cage steel gear planetary gear or BOOM at an inopportune time.
I am envious, sound slike a fun project. Wishing you best of luck.![]()
what specs will a good tc have for race and what for daily? What stall speed woud benefit me also ive heard that aftermarket tc will loose less power and slip less = gain mpg