shift pionts

[1983cucv]

What are the shift pionts (rpm) of the th400 in the 09'? Also, what is the stall speed on the TC?

Thanks.

 

[Westech]

well shift point will change with load and engine rpm. under regular driving the 09 should be in to 3rd gear by 30-35 mph. stall speed for a 6.2 should be around 900-1000 rpm. 1st at 10-15, 2ed at 20-25, 3rd at 30-35. if you want to change the shift points B&M makes a adjustible modulator for around 30 bucks.

 

[kingsley]

how does the adjustible modulator work?

 

[acetomatoco]

It delays or speeds up the vacuum actuation of the modulator...most tranny troubles in the M1009 series can be traced to the vacuum pump and the adjustment on the Injection pump which allows vacuum to get to the modulator... ACE

 

[CUCVFAN]

The vacuum valve on the injection pump is the main control of shift points. Rotate the top of it toward the front of the truck to increase shift RPM and rearward to lower it. Be sure to check the vacuum lines for leaks as well.

The adjustable modulator from B&M replaces the stock modulator on the side of the tranny and allows a few mph adjustment of the shift points too.

 

[1983cucv]

The reason I ask is I'm going to swap in a gas engine (250 L6) and want to use the th400 for it. The 6.2 has 240lbs of torque @ 2000rpm and the L6 has 235lbs @ 1400rpm. I'm hoping I the power bands are close enough not to change shift points. I may hit the junkyard and look for a gas 1ton with the th400 and take the module out to use on mine.

 

[acetomatoco]

Modulators are cheap at the auto parts store...just a few bux.. ACE