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**special-K** · 09-29-2020, 09:11 AM

I would leave that original rear in place and add an auxiliary transmission. You would not have to alter your PTO set-up, you would be leaving that truck as the cool not too common 11k# axle option that it is, and be doing what an innovative minded truck owner might have done back in the day. There was a company called Brownie that made units for this application and I know of guys doing their own engineering to install back to back transmissions. Twin sticking is just too dang cool and a totally vintage truckin' way to go. These days you could simply (other than the $1,600 cost) install an Advance Adapters Ranger 2spd. With an auxiliary transmission you will also have the ability to split shift, but would not have to if you didn't want. I believe you will gain a higher speed overdrive over using an overdrive transmission.

https://www.advanceadapters.com/cate...-splitter/236/

09-29-2020, 09:11 AM	#32
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,863	Re: C30 heavy duty rear axle top speed I would leave that original rear in place and add an auxiliary transmission. You would not have to alter your PTO set-up, you would be leaving that truck as the cool not too common 11k# axle option that it is, and be doing what an innovative minded truck owner might have done back in the day. There was a company called Brownie that made units for this application and I know of guys doing their own engineering to install back to back transmissions. Twin sticking is just too dang cool and a totally vintage truckin' way to go. These days you could simply (other than the $1,600 cost) install an Advance Adapters Ranger 2spd. With an auxiliary transmission you will also have the ability to split shift, but would not have to if you didn't want. I believe you will gain a higher speed overdrive over using an overdrive transmission. https://www.advanceadapters.com/cate...-splitter/236/ __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 09-29-2020 at 09:21 AM.