George Coleman
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Still looking for a 3.70 gear set out of a Alpine GT 69-70 model. Thanks
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Enjoy.
I still have an old set of 3.7's that 'burned up' when the front seal expired and the oil drained out. After replacing the seal, the gears still howled like crazy. Question: once the teeth are burred in any way, can they be repaired? Economically?
The complete rear end unit with the housing will not fit. It's wider than a series Alpine unit and has a different shock mount and spring mount. The entire gear unit is a bolt in on any series 5 as long as it has the original fine spline axles. It also fits a series 4. This green car has one of the 3.70 units as does our series 5.Just wondering if a complete 3.7 rear axle assembly from a GT will fit into a series 5 Alpine? or will just the ring and pinion interchange?
thanks
There are a couple minor things that would need changed in order to install the Arrow range housing under the series Alpine. The spring mounts of the Arrow range housing won't line up with the series Alpine springs so you would need to cut them off and move them inboard. If you want to continue to use the braking system of the series Alpine you would also want to swap backing plates since the Arrow range braking system is Lockheed instead of Girling.You can fit the later arrow series rear but its wider and you either have to roll the lips on the rear arches ir raise the body a little and fab some different top shock mounts on the body.
A local club member fitted one to his sII so he was making top telescopic mounts anyway. He had a bit of a suprise intially of the tyres scrubbing the rear lips so had to trim and roll the seams
I've often wondered if the longer yoke was used due to the two piece drive shaft of the GT and the movement in the center carrier bearing. I forgot about having to change that part before installing in the series 4 and 5. I do have a couple one piece drive shafts that was standard in the Alpine fastback that used the cast iron head engine. Some may have wondered why I mentioned changing the backing plates but you're right about the wheel cylinders and the entire brake system. I found that a similar wheel cylinders was used on some BMC cars of that era so kits are available.Why would anyone want to swap the complete rear end from a fastback or Arrow into a Series Alpine? Besides being too wide, the dual-piston slaves had got to be tough to source these days, as well as the shoes. But the diff gears are a straight swap. The only difference is that the input yoke is longer on the fastback diff. Some people say there's still enough slack in the driveshaft but I prefer to swap the coupling and not chance cracking the tailshaft housing or ruining the seal if I hit a big enough bump.