Ring and pinion swap in MF 1155????

MF rules

Member
Looking thru agcopartsbooks I ran across two different ring and pinion options......I'm guessing one set was for the manual 8 speed transmission and other set for the multipower 12 speed transmission????
One set is 7 pinion 36 ring gear......other is 8 pinion 41 ring gear. Does anyone know which is for 8/12 speed tractors?
The 1155 w 12 speed multipower I farm with has been turned up to 200hp and turbo'd and still seems gutless......my question is would changing the ring and pinion out to an 8 speed tractor ring and pinion change its pulling power??? Slower road speed???

I had a 1155 w 8 spd I farmed with for years then sold that was non turbo'd but turned up that would out pull my 1155 I now have.......is this because of the transmission or the difference in ring and pinions???
I feel I'm maxed out on getting more power out of my 12 speed tractor I now own so it has to have something to do with gearing or in rearend.
Wish I woulda never sold my old 8 spd tractor!!!!
Thanks for any help!
 
Changing the rear end gear probably won't do much. With the 7/36 gears you get a 5.14:1 gear ratio, with the 8/42 gear you get a 5.12:1 ratio. The 5.14 will multiply the torque a little bit more than the 5.12. The 5.12 will make you go a little bit faster.
 
So......would you guess it's the combo of gear ratios
in the 8 speed transmission along w the ring/pinion
combo that made my original 8 spd tractor pull
better.......people might call me nuts on this but I'm
here to tell ya the 8 spd tractor will pull circles
around a 12 speed tractor!

1155's with 8 spds seem hard to come by too!?
 
I'd say its the gear ratios in the transmission. After using my brothers 150 with multi-power for shredding (12 speeds), and then my 135 with a 6 speed. The 6 speed gearing is either too slow, or too fast from one gear to the next. I know the feeling.
 
Hi
There is a guy round here pulled one of those, if you are still farming with it leave it gutless, Tune her up and keep going you will start to find the week points in that trans and rear end he did a few times. If it's gutless you will quit running it hard before you wreck something.
When those tractors came into the U.K first, guys used them for heavy draft work like plowing. First they spun tires on rims, they fixed that . Then they spun the teeth or splines off gears and shafts in the trans and rear end. This was standard power non turbo tractors. Many of those 1135 and 55's here in Canada are junked for the same reason. a common problem other than final drives loosing teeth, is the couplings strip on the pto drive line, and where the drive goes from the gearbox to the rear axle.
Regards Robert
 
if it's pushing 200 hp you're going to shatter something,man I worked for had one it gave very little problems for the amount it was run until they put too much disc behind it,then turbo it and turn it up from 145 to 175 hp then it would get the job done,about 2 years later she had a crack develop across one off the final drive housings
 

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