cujo

Since my jake brake changes the shift pattern when turned on similar to tow-haul, do you guys still put tranny in t/h when towing or just turn on the jake? I don't want the two programs to "fight" against each other. I assume the jake trans program takes over anyway when it's on. Just wondering if I should just use one or the other. I've been using tow-haul when towing and turning the jake on when going downhill, doesn't seem to matter.
Steve

pevaguy

I leave the Jake on all the time and turn tow/haul on when towing. Works great for me towing 10K 5th. wheel.

TonyB

I've had the jake on and off w/ tow-haul & had no issues. It appears you are correct that the jake puts it in tow-haul.

I do leave min on all the time.

Tony

ptgarcia

My Pacbrake does the same thing, but without the tow/haul mode on shift points are not changed, but it does locks the torque converter up.

n2dwild

What it does according to Cummins is communicate with the trans so that anytime the jake is pulled, the trans sends the torque converter into lock up mode. Basically this is the same thing as tow haul mode just using a different switch....It will not hurt the truck to put it in tow haul mode and run the jake brake. The trans doesn't know the difference.

ptgarcia

Like I said, how it differs from tow/haul is shift points are unaffected.

Luvnacumns

Does anyone know if the jake will fit with my aurora????

carharttfarmer

ya it changes a little but not as much as when you use tow haul i general just leave mine turned on

n2dwild

I did this research thinking I was going to get a bigger turbo and found that the factory Jake brake will not fit with most aftermarket turbos. It's not because the jake won't fit on the turbo but because of how it attaches to the turbo (most aftermarket turbo exhaust shafts are longer by 1/2" to 1" and that is too much) and the limited amount of space up again the firewall. The stock Turbo with the jake brake is a tight fit with very little room to spare so adding another 1/2" or 1" puts the jake into the fire wall of the truck I know a guy who installed a Phat Shaft turbo and made it fit. It was not pretty when he got done with his firewall (pounded the @$%! out of his firewall to make room). Your better off going with an aftermarket exhaust brake that mounts down wind of the turbo unless you willing to modify your firewall?


My reasoning for getting a bigger turbo was to cool EGT temps when towing and I didn't feel that getting rid of my jake brake was a good trade off so I went with water/meth injection. Turns out I have all the power, spool up and cooling I need with my current set up (stock turbo) and I am happy.

carharttfarmer

well when we finally get around to eeting up shane you can measure from the firewall to the turbo on mine and check it against yours should know then

CTDinMT

n2dwild- you say "most" aftermarket turbos won't fit? Which ones do? I'd really like to run a towing turbo in conjunction with the Jacobs....