The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 47-55.1 1951 GMC Floor High Hump

chevyguyase · 03-10-2023, 02:56 PM

Sounds like leegreen and I are on the same page. I'm running a '54 chev. 3100, 250 eng, T5 trans and astro van 11 inch clutch. My floor is flat and I have plenty of room under the trans cover. I took a granny gear 4 speed out of it and modified the cover so it would be flat. I'm running a 3.46 ratio, 10 bolt rear axle, which works perfect for me. You're not constantly shifting from 5th to 4th on inclines. If you go this route make sure the 5th gear is around .70 to 1. The 4 cyl versions of these t5s are .90 to 1. 4th and 5th gear are almost the same.

03-10-2023, 02:56 PM	#16
chevyguyase Registered User Join Date: Aug 2015 Location: st charles missouri Posts: 220	Re: 1951 GMC Floor High Hump Sounds like leegreen and I are on the same page. I'm running a '54 chev. 3100, 250 eng, T5 trans and astro van 11 inch clutch. My floor is flat and I have plenty of room under the trans cover. I took a granny gear 4 speed out of it and modified the cover so it would be flat. I'm running a 3.46 ratio, 10 bolt rear axle, which works perfect for me. You're not constantly shifting from 5th to 4th on inclines. If you go this route make sure the 5th gear is around .70 to 1. The 4 cyl versions of these t5s are .90 to 1. 4th and 5th gear are almost the same.