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The Ford T18
The Ford T18 can be found in both 2wd and 4wd trucks from 1966-1986. T18s
Early Ford T18 T18 early
Early Ford T18 rectangular case has the reverse shift lever in the case above 1st gear. T18 early no cap
Early Ford T18 rectangular shift cap T18 early cap
Late Ford T18 T18 late
Late T18 case with side leg T18 late no cap
Late T18 shift cap with reverse lever in cap. T18 late cap
T18 different cases and caps side by side. T18 differences
The Ford T18 has a rectangular bolt pattern that measures 8 1/2" across both top holes. t18_ford_bell
The top to bottom holes are 6 1/4" on both sides. t18_ford_bell_1
The front input shaft is 10 spline x 1 1/16" and has stick out is 6 1/2" and has a tooth count of 17 or 23 teeth where it engages the cluster gear. A T18 with a 17 tooth input is the low geared (6.32-1) unit A T18 with a 23 spline input is a high geared (4-1) unit. The 6.32-1 Ford T18 will have two extra bosses cast on the front that will allow it to be installed against a GM bellhousing with relative ease.
The correct T18 bearing retainer measures 4.84" OD (same as a Jeep bellhousing) where it pilots into an AMC or Ford bellhousing.

The Jeep T18
The Jeep T18 case has a front pattern that is 8 1/2" across the top, 2 3/4" from the top to bottom hole on the left (drivers) side and 4.620" top to bottom on the right (passenger) side.

It has no provisions for any other pattern and it requires the use of a stud in the lower left hole in behind the clutch fork and is more difficult to use than a Ford T18.

It can have multitude of front shaft lengths and can have either 17 tooth (6.32-1) or 23 tooth (4-1) ratio.

It was offered in 2wd and 4wd version.The long front input shaft can be changed to the short (6.5" stick out) input.

A T18 with a 23 tooth (4-1) cannot be changed to a 17 tooth (6.32-1) input with out changing the cluster gear.