I have heard that leaving the transmission in D rather than OD makes the factory trans shift firmer. Is this true?

 

no

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91 RS W/carbed 350, Vortec heads, performer rpm, Comp cams Xtreme energy 280 grind. BFG Drag radials. 3.42 posi,Corvette servoed 700r4, ****ty stock converter
13.24@104

 

I thought it was to good to be true.

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1989 Iroc-Z TPI 350 auto 4-spd Removed MAF screens K & N filters, stock other than that.

 

It'll help you slow down at the end of the race though.

 

This post really belongs in the Transmission forum. Yes, the tranny does shift firmer in D. It uses different valving than in OD. With the tranny in OD, I merely get a hard 1-2 shift. With it in D, I get a chirp and a little lurch to the side on the shift. Definite difference between D and OD.

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91 Trans Am WS6
Bright White
5.0 TPI auto
Flowmaster 3" 2 chamber catback
Trans Go shiftkit
2000 stall converter

supposed 'peanut cammed' car (yeah, right)

Built on Wednesday

 

I never felt a diff, I ran mine in OD at the track

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91 RS W/carbed 350, Vortec heads, performer rpm, Comp cams Xtreme energy 280 grind. BFG Drag radials. 3.42 posi,Corvette servoed 700r4, ****ty stock converter
13.24@104