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Old 07-01-2004, 12:49 PM   #1 (permalink)
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Fj40 Flange?

How many different driveshaft flange patterns did FJ40s have, I thought there were only two? I must have a bastardized 3 speed xfercase cause I have three different driveshafts and none of them fit the pattern. WTF?
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Old 07-01-2004, 12:56 PM   #2 (permalink)
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I thought there were only 3 sizes, but SOR lists 5, 58-68 68-74 74-77 78-80 and 80-84
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Old 07-01-2004, 12:57 PM   #3 (permalink)
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do you know what the three you have are from ? what year t-case is it , what are the measurements of the pattern ? . do the driveshafts you have fit the pinion flange on the diff's ? what year axles are they ? please fill in the blanks so your question can be answered.
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Old 07-01-2004, 01:00 PM   #4 (permalink)
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might be easier to measure center of bolt hole to center of bolt hole pattern
then measure diameter of bolt holes on each flange. Parts are interchangeable and sometimes the difference in the pattern is the diameter of the bolt hole. With that info we can direct you to the appropriate flanges, years of driveshafts and year of ebrake drum etc.
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Old 07-01-2004, 01:18 PM   #5 (permalink)
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Case is a 72, axles are 78, Flange measurements are approximately 2 1/4" X 2 1/2." from center bolt to center bolt. I thought this was pretty much a 4 speed flange pattern??
Driveshafts I have are, 2 sets form early cruisers one has the small bolts, the other one of these sets appears to be modified chevy driveshifts.........don't ask, I don't know why.
The third set came of a FJ55, 4 speed case not sure of the year.
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Old 07-01-2004, 01:29 PM   #6 (permalink)
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the early drive shafts you have are too early. the fj55 one is to new and has holes that are larger and the pattern is bigger also. I have a 70 3-spd case and it sounds like you have same flanges I have. Your 78 axle flanges might match the fj55 4 spd . driveshaft I am not sure . Can you confirm that the pattern on the t-case does not match the axles ? If it is infact different then I would say you could do like I had to and pull the pinion flanges and replace with ones from Randy's ring and pinion . They are about 60 dollars and have the 4 spd . pattern and the early 3 spd . with larger bolt holes pattern drilled already. ask them to press on the dust shield before they ship. Then get drive shafts off e-bay from early 70's fj40. You could also put 4 spd. flanges on the t-case and get late 70's 4 spd. driveshaft.
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Old 07-01-2004, 01:34 PM   #7 (permalink)
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Flange pattern on the case and axles are the same.
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Old 07-01-2004, 01:44 PM   #8 (permalink)
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that don't add up unless someone put 3 spd early 70's flanges on axles. or 4 spd. late 70's flanges on the t-case. The measurements you posted match my 70 t-case so I would say that the drive shaft from early 70's fj40 should work. FYI , I ordered a custom shaft from Driveline solutions for my front and I sent him the measurments for my flanges ( which seem to match yours) . When I got the drive shaft the pattern matched but he had drilled the smaller holes . So it does appear that the early small pattern exists with 2 sizes of bolt holes depending on year.
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Old 07-01-2004, 02:24 PM   #9 (permalink)
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58-68 is small pattern, 8mm bolts
69-late 73 is small pattern(same as 58-68 but 10mm bolts)
74-84 is the same pattern, diff is in the t-case output flange spline size/count
output flange:
74-77 coarse spline(same as coarse pinion)
77-80 fine spline one piece case(same as fine spline pinion)
80-84 fine spline, but much larger than one piece fine spline(larger than fine spline pinion).
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Old 07-01-2004, 08:55 PM   #10 (permalink)
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Something was changed either tcase flange or the pinion, now I just need to find the correct parts..............Unfortunately it is an extreme PITA finding parts up here. One of the last things I need to do to get my 62 FJ on the trail....so close!
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