I have a 90 F350, 7.3L, 4.11, 5 spd., dually and pull a 30 ft. 5th wheel. There are about 150,000 miles on the engine. It doesn't smoke bad and doesn't use too much oil. Would an aftermarket turbo be advisable or would I be risking damage to the engine?
I am also considering a 2-spd. gear splitter that mounts on the end of the transmission. Does anyone have experience, good or bad, with these splitters?
Thanks.

 

I put an ATS turbo on mine with 160,000 miles on it and it screams.

Dave

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I put a Gear Vendors Overdrive on my 99 Power Stroke and had good luck with it. I found that I could leave the tranny in third and pull with the GV in overdrive and I'd have more RPM's and therefore more power than if I tried to pull with the tranny in Overdrive. If I needed more power, I could either shift the GV out of overdrive and therefore be in 3rd or I could leave the GV in overdrive and let the tranny shift down to 2nd. I haven't installed it yet on my 2000 truck but plan to.

One word of caution, any gear splitter you put on changes the geometry of your drive line. On mine, they had to move the carrier bearing back one frame member. Doing this can be tricky because it can change the pinion bearing angle in your differential which can cause a vibration at low speeds. If the vibration is excessive you could damage some things. Also, a little vibration is ok as long as it occurs at startup and disappears below 12 mph and you are able to accelerate out of it. You never want to be moving and move into the vibration.

The weight of your trailer on the truck will change the pinion bearing angle so just consider how much your truck squats with the trailer attached before you install it. / Dave