I am finishing up a winter project, a 32 baja with a set of new 8.1 S HO (496 HO), runing velvet drive trannys and TRS drives, how much HP can these saftly handle?

i have heard they are good to right around 500HP. a bit more if you watch the throttles. a friend of mine had 750's on trs's in a 38 scarab and went through a bunch of drives every season. should be fine with the 496's

thanks glass, do you know what the weak link is with these drives, do they self destruct or just twist shafts ect.

TRS Drives are known to blow the lower gears,especially the right hand rotation.JP Clear on here has had success with cryogenic treatment of gears and shafts.I think that he is pushing some serious hp in single engine V bottom.

Rob

If the drives are put together with the machined shim in the lowers , they are good to about 600 hp. If there put together with the regular crush ring I would say 500hp . The weak link in the drives are the right hand drive . The lower gear in the right hand drive that is located aft of the vertical drive shaft is the most common problem .This gear is not as well supported as the left hand drive . The left hand drive gear is located fore of the vertical shaft and is much better supported. The key to these drives is to machine the shim for the lowers and a make sure that the preloads on the bearings are proper. You should be more than fine with the 496's. Tom

Baby it out of the hole, and don't air it out all of the time, and you'll be fine! I love TRS drives!

I've had several TRS boats and they have worked very well for me. I had a lower gear failure last spring and then I replaced both left and right lower gears with the Cryo treated gears and have not had a problem since. Not sure what my hp is but I think I'm around 700

I would have to agree that the nose of the TRS gear-case provides better support for the prop-shaft gear than the carrier assmb. behind the pinion as used with the right hand drive, but I don't understand why the crushable ring won't work as well as a machined shim. The load pushing on the gear is directly against the carrier thrust ring and not the load ring. Can someone please explain? And yes; I highly recommend cryo-treating. Just be sure you have an EXPERIENCED professional do the assembly work. Shimming for bearing preload and gear lash is CRITICAL and the upper and lower must set up as a unit...not independently. I feel that most TRS drives that have been apart fail because they were not reassembled quite properly. I'm inputting about 600 H.P. to a RH drive with no problems, but I'm not a cowboy. --- Jer

Thank-you everyone, I am very impressed with the vast knowledge in this web site. I am going for a first time brake in run this weekend, ill let ya know how it all turns out

jp, you hit it right on the head, I cannot see a benefit in the solid shim.