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73-87chevytrucks.com
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73-87 Chevy _ GMC Trucks
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Tremac tkx
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Topic: Tremac tkx (Read 1895 times)
Swampyankee74
Frequent Member
Posts: 321
Keep em alive
Tremac tkx
«
on:
December 17, 2023, 04:15:39 PM »
Has anyone installed a tremac tkx in these trucks? Looks to me like the transmission cross member would have to slide backwards about 1-3/8". But not sure if the height of the cross member is correct. Also I have a low hump truck. Looking to put it in a 74 gmc c15. Looking forward to any info, pros or cons
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Captkaos
OWNER and Administrator
Administrator
Senior Member
Posts: 18382
Re: Tremac tkx
«
Reply #1 on:
December 18, 2023, 04:45:19 PM »
I havent but as with any transmission swap that doesnt match the factory offerings you will have to adjust the trans crossmember to fit. As for the height, you need to verify this as you generally want it to be 2.5-3 degrees down and the axle yoke 2.5-3 degrees up.
A 4L80E will fit under a low tunnel trans so if it doesn't fit we sell an uncut transmission tunnel cover. You would just need to cut the floor tunnel accordingly and bolt it in.
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Chris Lucas
73-87chevytrucks
captkaoscustoms
squarebody
Swampyankee74
Frequent Member
Posts: 321
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Re: Tremac tkx
«
Reply #2 on:
December 19, 2023, 06:20:41 PM »
Thank you capt!!
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Swampyankee74
Frequent Member
Posts: 321
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Re: Tremac tkx
«
Reply #3 on:
January 03, 2024, 04:12:49 PM »
Just ordered a tremac tkx close ratio with 2.28 first gear and .68 overdrive from sst transmission out of Tennessee. Sst was very helpful matching the gearing to the truck. Hopefully all goes well. I'll keep you guys posted on the install
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Swampyankee74
Frequent Member
Posts: 321
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Re: Tremac tkx
«
Reply #4 on:
January 03, 2024, 07:51:16 PM »
Correction 2.87 first gear
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Swampyankee74
Frequent Member
Posts: 321
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Re: Tremac tkx
«
Reply #5 on:
February 03, 2024, 07:40:05 PM »
Dial indicated my lakewood bellhousing. It is out .004" with is within the .005" or less window tremec requires. I was very lucky considering I've read where people have lakewoods that are out.028". New transmission arrived. Have it put in place but need to open up my floor on my low hump truck a little bit more in order to bolt down the shifter. The large Hurst shift boot I already had installed should cover it.
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Swampyankee74
Frequent Member
Posts: 321
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Re: Tremac tkx
«
Reply #6 on:
February 03, 2024, 07:44:09 PM »
My crossmember had to be slid back 1-3/8", there was already holes in the frame at this point.i bought this transmision through silver sport transmission. They verified the height of the crossmember in my 74 c15 will hold the tranny at the proper elevation. Still a bunch of work to do. But she will fit without major modifications.
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Swampyankee74
Frequent Member
Posts: 321
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Re: Tremac tkx
«
Reply #7 on:
February 03, 2024, 07:46:38 PM »
Pic
Sent from my SM-S236DL using Tapatalk
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Swampyankee74
Frequent Member
Posts: 321
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Re: Tremac tkx
«
Reply #8 on:
February 22, 2024, 06:42:57 PM »
Tranny is in the truck! She is rolling. Back and forth in the garage anyhow, first and reverse. Roads are white with salt and calcium. Gotta Waite a bit for the shakedown cruise. But no weird noises at an idle in neutral or idle in gear with clutch in. So far it is promising.
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Swampyankee74
Frequent Member
Posts: 321
Keep em alive
Re: Tremac tkx
«
Reply #9 on:
March 08, 2024, 06:27:32 PM »
It has rained for the last 4 days in Connecticut. Hopefully enough to wash the salt and calcium off the road... took my first shakedown cruise with the 5 speed in it tonight. Did about 40 miles. 10 of them highway. So far so good, no weird noises, smooth shifting. Slightly lower first gear is nice compared to the m21. Cruising at 65 on the highway just under 2100 rpm.
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Mr Diesel
Frequent Member
Posts: 336
Aaron
Re: Tremac tkx
«
Reply #10 on:
March 09, 2024, 08:30:26 AM »
Looks like you have a hydraulic clutch installed. Would it have been an option to keep the old manual linkage instead?
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1976 C20 Crewcab, 6.2L/SM465
1982 K30 Crewcab , 427TD/TH400
1983 C30, 6.2L/TH400
1983 K30 Crewcab 454/700R4
1986 K10 350/400. 1989 K30 cab/chassis 454/SM465
Swampyankee74
Frequent Member
Posts: 321
Keep em alive
Re: Tremac tkx
«
Reply #11 on:
March 09, 2024, 08:39:13 AM »
I still have the stock mechanical linkage hooked up.
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Swampyankee74
Frequent Member
Posts: 321
Keep em alive
Re: Tremac tkx
«
Reply #12 on:
March 09, 2024, 08:41:45 AM »
Pic
Sent from my SM-S236DL using Tapatalk
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Mr Diesel
Frequent Member
Posts: 336
Aaron
Re: Tremac tkx
«
Reply #13 on:
March 09, 2024, 01:49:52 PM »
Nice. I've been a fan of the simplicity found with the old mechanical linkage. Probably never get around to a TKX swap myself but looks like a good option.
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1976 C20 Crewcab, 6.2L/SM465
1982 K30 Crewcab , 427TD/TH400
1983 C30, 6.2L/TH400
1983 K30 Crewcab 454/700R4
1986 K10 350/400. 1989 K30 cab/chassis 454/SM465
Shifty
Junior Member
Posts: 961
I bleed Bowtie red...
Re: Tremac tkx
«
Reply #14 on:
March 09, 2024, 03:17:21 PM »
I like the swap Swampy!
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87 V20 Standard Cab Longbed (current)
87 R30 3+3 Longbed (days of yore)
98 C2500 ext cab longbed
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Tremac tkx