millertime1321
New member
- Joined
- Oct 17, 2011
- Messages
- 4
Ok, so I've searched for some info on these and got a lot off some ford forums and heavy duty forums, but I'm missing some key elements. I wanted an auxiliary overdrive and I have been reading a lot about guys burning up their gear vendors. With us gear being out of business I wanted to find something like a spicer 5831 since its light enough for our trucks but still heavy duty and has an overdrive. I have a 47rh and wanted to find some info on how well this might work behind an automatic. These are not synchronized so in a manual id have to double clutch and match speed. My question is with an automatic I should be able to do the same by letting off the gas and pushing it into overdrive. My fear is that by doing that it would put a lot of stress on the output shaft shifting on the fly. Is this just a pipe dream here or is there a possibility of using this as a good heavy duty upgrade over the gearvendors. It would allow me to keep the low 4.10 gears and gain some cruising mileage. Does anyone have any experience with these?
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