swiftjustice44
Central Coast Brickyard
- Joined
- Feb 12, 2007
- Location
- DALLAS
OK. I have the G80 out of a 91 740T w/ 3.73 1041 and ABS tone ring. I want to put into my 89 240 w/ a 1030, also a 3.73. I've read as many of the prior threads as I could. Still have some questions. From my reading, it seems no one changes the pinion gear. It's my understanding that ring gears and pinion gears are matched sets. Is no one getting any whining or other issues? Also, will cutting out three teeth to reduce the tone gear count from 48 to 12 really work? I measured the gap on the non ABS tone ring and the gap is roughly 3/4 inch but measuring between 4 of the ABS slots is about an inch and it's obvious the diameter of the ABS tone ring on the G80 is larger. One revolution is one revolution, I know...but is it really that simple?
Also, it's my understanding the 240's passenger side axle needs to be shortened...but how much? Kenny's article from a few years ago said 4mm but a recent thread mentioned 1/2 inch.
This rear end is going into my 80GT eventually. It has a 3.91 that I'd really like to use. Originally, I had thought I'd just use a mechanical speedo (I'm swapping in LH2.4 and the newer dash) but I've learned the speedo pulse goes from the speedo to the ecu. Does anyone know for sure what the ecu needs it for? Is it just cruise control or something equally benign like a shift light? If I could use the 3.91 I'd be faced with false speedo readings for sure. But...if the ecu doesn't need the signal for fueling then I could use the 3.91 w/o a tone ring and run a cable speedometer.
Any knowledge greatly appreciated.
Also, it's my understanding the 240's passenger side axle needs to be shortened...but how much? Kenny's article from a few years ago said 4mm but a recent thread mentioned 1/2 inch.
This rear end is going into my 80GT eventually. It has a 3.91 that I'd really like to use. Originally, I had thought I'd just use a mechanical speedo (I'm swapping in LH2.4 and the newer dash) but I've learned the speedo pulse goes from the speedo to the ecu. Does anyone know for sure what the ecu needs it for? Is it just cruise control or something equally benign like a shift light? If I could use the 3.91 I'd be faced with false speedo readings for sure. But...if the ecu doesn't need the signal for fueling then I could use the 3.91 w/o a tone ring and run a cable speedometer.
Any knowledge greatly appreciated.