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12-18-2013, 02:56 PM | #1 |
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85 Suburban TH400 to 4L80E swap
I am preparing to change the TH400 in my 85 2WD C20 Suburban 454 to a 4L80E transmission. Does anyone have experience with what needs to be done for the crossmember?
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12-18-2013, 06:47 PM | #2 |
I know the pieces fit
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Re: 85 Suburban TH400 to 4L80E swap
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12-19-2013, 11:27 AM | #3 |
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Re: 85 Suburban TH400 to 4L80E swap
No details in that thread about the cross member modifications.
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12-19-2013, 11:43 AM | #4 |
I know the pieces fit
Join Date: Nov 2007
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Re: 85 Suburban TH400 to 4L80E swap
I think he said he used the stock cross member with the 4L80E mount.
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12-20-2013, 12:39 AM | #5 |
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Re: 85 Suburban TH400 to 4L80E swap
when I put an 6.0l/4l80e in my 86 Suburban (originally a 350/th400) I used Dirty Dingo mounts. all I had to do was re-drill the cross member holes in the frame around 1.5" back. but the cross member its self needed no modification. The 4l80e trans bushing bolted right to the cross member.
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01-14-2014, 05:17 PM | #6 |
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Re: 85 Suburban TH400 to 4L80E swap
I am starting this swap project. I have the transmission and torque converter complete and ready to install. Transmission is fresh overhauled with a shift kit, manual speedometer output housing with gears and deep aluminum pan.
I will try to update with progress and pictures as I work on it and make progress. |
05-10-2014, 03:06 PM | #7 |
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Re: 85 Suburban TH400 to 4L80E swap
Moved the transmission crossmember back to line up the front crossmember bolt holes with the rear bolt holes in the frame and the mount on the transmission lines up perfectly. Drilled new rear holes in the frame using the crossmember as a template and bolted everything up. Transmission and torque converter are now installed and bolted in.
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07-14-2014, 10:50 AM | #8 |
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Re: 85 Suburban TH400 to 4L80E swap
Driveshaft shortened 3-3/8 inches and re installed. Cooler lines from TH400 moved back 2-3 inches and re bent to fit 91-96 4L80E case.
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07-26-2014, 09:26 AM | #9 |
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Re: 85 Suburban TH400 to 4L80E swap
Installing the TCI Transmission control unit and TPS sensor this weekend, That just leaves the shifter linkage and speedometer cable left to finish up.
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03-11-2015, 07:47 PM | #10 |
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Re: 85 Suburban TH400 to 4L80E swap
Nice write up, I have been thinking about the swap with my 454 swapped c10 if you could please send me that info also! Thank you!
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Current Build 89 s10 ecsb 2wd 4.3/700r4 50k OG Miles Instagram- shaggin_s10 '86 Chevrolet C10 Custom Deluxe - Gen V 454 - 4l80e - welded 12 bolt (Build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=611611 ) SOLD |
03-11-2015, 08:18 PM | #11 |
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Re: 85 Suburban TH400 to 4L80E swap
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03-12-2015, 12:28 PM | #12 |
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Re: 85 Suburban TH400 to 4L80E swap
Any reason not to post the speedo conversion info here ? I am interested too. Do you sell the kit ?
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03-12-2015, 03:16 PM | #13 |
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Re: 85 Suburban TH400 to 4L80E swap
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09-28-2018, 08:49 AM | #14 |
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Re: 85 Suburban TH400 to 4L80E swap
could you send me the speedo info to
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09-28-2018, 09:36 AM | #15 |
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Re: 85 Suburban TH400 to 4L80E swap
I will send the Info to you.
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10-17-2018, 08:27 PM | #16 |
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Re: 85 Suburban TH400 to 4L80E swap
Grady's Performance did you use the th400 linkage part that's on the trans or did you use a 4l80e? I'm almost done with my swap and am stuck on this
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1977 GMC Sierra Classic CCDW. 454 worked 781s, 277/287, Lift .502/.501 LS 114, Dual plane intake, Dana 70 (4.10) and 4L80e (HD2 kit). http://67-72chevytrucks.com/vboard/s...63#post8361863 |
10-18-2018, 03:58 PM | #17 |
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Re: 85 Suburban TH400 to 4L80E swap
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1977 GMC Sierra Classic CCDW. 454 worked 781s, 277/287, Lift .502/.501 LS 114, Dual plane intake, Dana 70 (4.10) and 4L80e (HD2 kit). http://67-72chevytrucks.com/vboard/s...63#post8361863 |
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