Go Bottomt100 axle question
 | LWFCD
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2004-08-26 94586
95 T100 ext cab 6 cyl 5 speed dx 2wd. Bent the rear differential axle housing now both rear tires wearing. Junkyards they ask for gear ratio either 3.77 or 3.91 for the correct replacement. The gear code from my VIN JTxxxxxx plate is C/TR 3K3/FF44 A/TM A08A/R150 tires 15X6. Will either fit without any problems. Cant find an exact information on my axle code either is it 138mm, 4.11 and 2 pinion. Lost in limbo, Help?
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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada 
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2004-08-26 94588
I can't help with which one to choose.
But I can tell you that those ratio's are so close that your speedometer won't know the difference. They are about 5 percent apart. That is about 3 mph on the speedometer at highway speeds.
I would guess that if it bolts up and fits everywhere, you are safe with either ratio.
....
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| DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2004-08-26 94589
Another thought...... I wonder if one of those ratios is exclusive to a 2wd model and the other to a 4wd????? ....
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 | AV8R
Join Date: Oct 2003 Posts: 882 North Central Wisconsin 
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2004-08-26 94650
Lift up the rear of the truck, tape a piece of string to the drive shaft, turn BOTH rear wheels one rotation forward TOGETHER and count how many times the string has wrapped around the driveshaft. 3-3/4 times = 3.77 almost 4 times = 3.91
The engine computor, abs, trans, etc. may get cranky with the wrong ratio.
Saw this trick in an old HOT ROD mag. ....
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