1988 Crew Cab Dually 4Spd Manual to TH400 Conversion? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

milehightoyz · 07-21-2005, 02:13 PM

Hi Guys,

I have a 1988 Older Box Style 454 Crew Cab Dually. 454 TBI injection with manual 4 Speed. What do I need to convert to automatic?

As far as tranny interchangeability do I need a TH400 long tail or short tail? Looking to sue original mounts and driveshaft?

Any advice is greatly appreciated.

Thanks,
John

milehightoyz · 07-22-2005, 07:39 PM

bump

odee · 07-22-2005, 08:15 PM

the frame should have the bolt holes in it for the location with the auto. The front shaft will have to be redone to fit the auto. Then a switch for the passing gear for the tranny on the gas pedal. I have done this a few times for guys in my area, went to manual tranny in my truck of same vintage.

07-21-2005, 02:13 PM	#1
milehightoyz AttentionDeficitDisorder Join Date: Mar 2005 Location: COLORADO Posts: 600	1988 Crew Cab Dually 4Spd Manual to TH400 Conversion? Hi Guys, I have a 1988 Older Box Style 454 Crew Cab Dually. 454 TBI injection with manual 4 Speed. What do I need to convert to automatic? As far as tranny interchangeability do I need a TH400 long tail or short tail? Looking to sue original mounts and driveshaft? Any advice is greatly appreciated. Thanks, John

07-22-2005, 07:39 PM	#2
milehightoyz AttentionDeficitDisorder Join Date: Mar 2005 Location: COLORADO Posts: 600	bump

07-22-2005, 08:15 PM	#3
odee Registered User Join Date: Nov 2004 Location: big stone gap va Posts: 83	the frame should have the bolt holes in it for the location with the auto. The front shaft will have to be redone to fit the auto. Then a switch for the passing gear for the tranny on the gas pedal. I have done this a few times for guys in my area, went to manual tranny in my truck of same vintage.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.