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Old 11-12-2017, 02:01 AM   #21 (permalink)
davester
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Might be like my engine, one of the 4l80e transmission bolt holes isn't used because the engine block is too thin at that spot (that's how someone explained it to me here), so no bolt.

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Old 11-12-2017, 03:41 AM   #22 (permalink)
MrMarty51
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Just reading through this thread, nice job on the transmixer 67.

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Old 11-12-2017, 10:00 AM   #23 (permalink)
1967KaiserM715
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Quote:
Originally Posted by davester View Post
Might be like my engine, one of the 4l80e transmission bolt holes isn't used because the engine block is too thin at that spot (that's how someone explained it to me here), so no bolt.
If I remember you used a '03 4l80e, which was originally mated to a LSx engine, which means there is a top/center bolt not used in previous models, but you should have still used 6 bolts, I could only fit 5 bolts.
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Old 11-12-2017, 02:24 PM   #24 (permalink)
davester
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I put a '06 4l80e in my '04, which has a LQ4. I believe the missing bolt for me was not the top bolt, as that has the clip for the transfer case vent tube and a wiring harness. I believe the missing bolt was the one next to it on the passenger side.

Here's where I found out about this "issue" with the engine block:
https://www.dieselplace.com/forum/76-...ml#post8822289
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Old 11-12-2017, 05:01 PM   #25 (permalink)
1967KaiserM715
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oh, yeah LS engines don't use that hole, which is why the later 4l80e have 7 bolt holes, and use 6 bolts. The 6.x diesel and previous engines don't use the top bolt hole, which is not the case here, I should still have 6 bolts, only have 5 installed.

I do have a code 85, ratio code, so I need to figure that out.
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Old 12-04-2017, 07:11 PM   #26 (permalink)
1967KaiserM715
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haven't done too much, but haven't quite figured the Code 85, plus it seems like its not shifting completely right, I plan on either getting plates later this week or the next. been pretty busy with other things, including spitting out my driveshaft in my other truck.

I was up under it, put in two new speed sensors...and with the way the wiring is, realized that maybe my problem was that the wires got crossed? maybe someone can confirm wire colors for the front speed sensor, and maybe some pics of how the wiring is supposed to run, its pretty haphazard and seems like it would hit either the driveshaft or the linkage for transfer case.
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Old 12-04-2017, 08:07 PM   #27 (permalink)
Glagulator
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Do you have 2 speed sensors on the tranny and another on the xfer case?
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99 CREW LONG SRW C3500 work truck 199k+ mi. orig. motor & trans 4.10, modded engine harness, new oil cooler & lines, all new front end parts and poly bushings, trans poly mount, all new brakes.
96 SUBURBAN K2500 wife's truck 210k+ mi. orig. motor & trans, 3.73...
95 C2500 Suburban 6.5td HO w/p, timing set, HB & pulley, all rubber hoses, modded engine & main harness, converted to OBD2, PMD to bumper...
95 C1500 Suburban 6.5td rebuild tranny, convert to DB2, replacing as many parts as I can.
96 C2500 Suburban 7.4L converting to 6.5td w/ DB2, 4L80, 3.73
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Old 12-04-2017, 09:40 PM   #28 (permalink)
1967KaiserM715
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Yes, there is the rear speed sensor on the transfercase, from what I understood, 91 and 92 only used that for the speedometer? Maybe I misunderstood.

And yes two on the transmission for 3 total

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Last edited by 1967KaiserM715; 12-04-2017 at 09:50 PM.
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Old 12-04-2017, 09:52 PM   #29 (permalink)
Glagulator
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91-93 used 3 speed sensors because the TCM needed to know when low range was selected. 94-up have that programmed in and only have a switch to indicate low range and no VSS on the back of the tranny.

4L80e speed sensors on a 1991 6.5td
with 4wd.

Front VSS (ISS) on 4L80
DK. BLU/WHT and GRY/RED go to TCM

Rear VSS on 4L80
DK. GRN/YEL and LT. BLUE go to TCM

VSS on xfer case
LT. GRN/BLK and PPL/WHT go to VSSB
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There are 10 kinds of people in this world; Those who understand binary and those who don't.

99 CREW LONG SRW C3500 work truck 199k+ mi. orig. motor & trans 4.10, modded engine harness, new oil cooler & lines, all new front end parts and poly bushings, trans poly mount, all new brakes.
96 SUBURBAN K2500 wife's truck 210k+ mi. orig. motor & trans, 3.73...
95 C2500 Suburban 6.5td HO w/p, timing set, HB & pulley, all rubber hoses, modded engine & main harness, converted to OBD2, PMD to bumper...
95 C1500 Suburban 6.5td rebuild tranny, convert to DB2, replacing as many parts as I can.
96 C2500 Suburban 7.4L converting to 6.5td w/ DB2, 4L80, 3.73

Last edited by Glagulator; 12-04-2017 at 09:53 PM.
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Old 12-04-2017, 10:19 PM   #30 (permalink)
1967KaiserM715
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Awesome, thanks, will check that out.

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