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Old 03-05-2019, 11:40 AM   #5
skyphix
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Join Date: Sep 2018
Location: Hampden, ME
Posts: 408
Re: 4.8 to th350 troubleshooting

1200-1500 is probably the stock stall rpm for that converter if its the stock converter, I think you're probably fine but hopefully someone else will chime in as well. I was thinking it was revving up beyond, say, 2500-3000 with the stock converter.

It could be that the stock converter is getting worn, so its not doing any partial engagement.
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1980 C10 SWB
2003 Chevy Suburban 2500 LT
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