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Originally Posted by 86 Red_Bowtie
Before i changed my rearend gears from 3.08 to 3.73 i ran 1700 rpm going down the highway at 70 mph and was only getting 12 mpg. After the change it runs at 2600 rpm
going 70 mph and i am getting 15 mpg and i doesn't kick down on every hill i go up like it did running 3.08. So all in all if your going to stay with 2.73 rear end gears i would go with the TH 350.
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Mine was the same, I got right under 13 running mine right after the rebuild with the 3.08's. It was running about 1300 locked up at 60. It would downshift sometimes to 2nd for even a tiny hill. I've just got it back somewhat reliable so I dont have a number for switching to the 3.73, it does run right at 2k @ 60 (I think speedo is waaay off) so hopefully that takes care of all the downshifting and will result in better milage. This is with a 275/60/15 rear tire.
86--if you swap to the T350 make sure to get a 9" tailshaft version and you wont have to mod the DS. You will have to move the crossmember forward (towards the engine) about 2" or so. If your lucky the holes will already be in the frame.
