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Old 12-02-2016, 12:03 PM
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fsj1978 fsj1978 is offline
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Join Date: Mar 31, 1986
Location: Chino
Posts: 634
Column shift help needed

I need an extra low gear select on the factory 78 column. I'm converting to a 4L80E and already made the linkage, all the detents are identical to stock other than needing 1 notch lower for 1st gear.. I notched the tube where the shift lever comes out of the column but there's something internal keeping it from rotating any further than the factor 1st gear, which is now 2nd gear for me.

I know some of you have had yours apart to rebuild or whatever, and would appreciate any knowledge you can send my way.

Thanks in advance!
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'75 Cherokee "Hercules" (360 / Holley Commander 950 / Holley"Z"intake)
.....(4L80E / NP-242 / Front & Rear D60 - 4.88 rear ARB / 37s)
.....(York air / Ramsey RE8000 winch / CB / HAM / custom dash)
.....(Forward tilt hood / widened flares / custom rear bumper with tire carrier & air hose storage)
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Old 12-03-2016, 10:47 AM
gpcl16 gpcl16 is offline
232 I6
 
Join Date: Apr 02, 2016
Location: California
Posts: 121
Aren't the detents inside the transmission?
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1988 Jeep Grand Wagoneer
4" BDS Suspension Lift
Tru-Trac Rear
Howell GM TBI with Custom Tune
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Old 12-03-2016, 11:06 AM
fsj1978's Avatar
fsj1978 fsj1978 is offline
just got here....
 
Join Date: Mar 31, 1986
Location: Chino
Posts: 634
The detends or 'clicks' that you feel are indeed in the transmission. But the... shift pattern is inside the column. And it seems that includes the stops for full throw up (park) and full throw down (1st gear).

All the transmission detents line up with perfect with the Jeep shift pattern, I just need a little more throw since I now have an extra gear.
__________________
'75 Cherokee "Hercules" (360 / Holley Commander 950 / Holley"Z"intake)
.....(4L80E / NP-242 / Front & Rear D60 - 4.88 rear ARB / 37s)
.....(York air / Ramsey RE8000 winch / CB / HAM / custom dash)
.....(Forward tilt hood / widened flares / custom rear bumper with tire carrier & air hose storage)
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  #4  
Old 12-03-2016, 12:13 PM
gpcl16 gpcl16 is offline
232 I6
 
Join Date: Apr 02, 2016
Location: California
Posts: 121
Gotchya. Maybe others with more experience can chime in? Something in your fabbed linkage probably needs to be re-fabbed to accommodate additional throw without modifying the column. Having seen a few old GM cars that were converted from TH350 to TH700 they seemed to use the old linkage. The way I understand it the overall throw in the column should be about the same for a GM 3 speed or 4. Just the detent positions in the trans are all just a little closer together. In other words, I don't think GM changed anything in their steering columns when the TH700 came out, they just modified the linkage and the shift indicator to match.
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1988 Jeep Grand Wagoneer
4" BDS Suspension Lift
Tru-Trac Rear
Howell GM TBI with Custom Tune
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