xr6 Lower unit change

[Iron Horse]

I have a '92 150 xr6 S/N-0D137211. According my research the lower unit is a 4 1/4 inch diameter gearcase with a 1.87 gear ratio. Will a 4 3/4" gearcase fit this motor and will there be any performance difference?
Thanks

[Capt.Insane-o]

Small cases have a 1.78 ratio. You may need to reprop or buy the filler ring for your prophub to close off the exhaust

[tlwjkw]

https://bobsmachine.com/product/blow-out-ring/

maybe/maybe not?.. try it without first.. its gonna ventilate but sometimes that's a good thing.. depends on purpose and your overall rig...

[patchesII]

Depending on your application, the larger case with a 1.87 may be better

[Iron Horse]

Thanks for the info guys. Re-propping is a definite as it was over propped when I bought it. Any recommendations on where to get a good reman lower unit at a fair price? Also looking at props but there is a ton of different ones out there. Prop will be going on a Ranger451V. Length 17.5 ft. 84'beam Speed is not the #1 priority but looking for a good balance between hole shot and top end. Any recommendations on props to consider would be appreciated.

[Merc 2.5]

Prolly trophy or similar for a good starting point

[Iron Horse]

Thanks Merc
You are the second one to recommend a Trophy, so I am going to try to find one to test.

[tlwjkw]

if ya go to a bigger case try a tempest also if ya run across one..... kinda scarce but work good on some rangers..