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Thread: 6395 7427 8625 Manual Trans Calibration Listing

  1. #1
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    6395 7427 8625 Manual Trans Calibration Listing

    There are a handful of calibrations specifically listed for manual transmissions with these pcm's. There are no 305 or 350 manual trans cals. Here is the breakdown:

    Code:
    PCM               4.3                 7.4
    6395            BJFD, BDXS         BHDB, BHDC, 
                    BHDD
    
    7427            BJWT, BJXJ,        BMHJ, BMHK, 
                    BJWU               BMHL 
    
    8625            BDXW, BBMW,   
                    AYXY, BAAK, 
                    BCPK, BCPL,
                    BCPM, BDWZ, 
                    BDXA, BDXC,
                    BDZA, BDYX
    This list was compiled using the following transmission RPOs:
    mg5, mt8, mw1, mw3, and my2. No additional truck manual transmission rpos are known for the vehicles which use these pcm's. If you have a specific manual trans RPO you'd like to have checked I'll be glad to do it.

  2. #2
    EFI GearHead ! EagleMark's Avatar
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    What's strange is we know from other thread that 5.7L came with manual trans! But whenever I find a listing for manual trans it comes back to PCM that you did not include! 16156930

    To further explain here is my post from that thread and theory...:
    BJYN in Cal Data shows 5.7L Manual 16197427 (superceded to BPSA and differant PCM 16156930) so I thing the BCC Lookup spread sheet is same database as CalData.

    On BCCFind it says Trans Type= all/no listing just like the other one gregs78cam posted and he swears it came from an auto truck. CalData shows it to came from PCM 16156930 but it is in 16197427. So maybe GM did not had learned by then how to have a bin for both? By seeing 2 of these now I'd bet the 16156930 PCM is missing a few pieces needed for auto trans?

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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    Manual transmission trucks with 5.0 / 5.7 came with a C3 ECM. There are three numbers, 16156480, 16196396 or 16171199.

    BJYN is not a manual transmission calibration. BJYN is a G van calibration and G vans were not available with a manual transmission. The database has M for manual, A for auto, or sometimes it has nothing at all. GM's own software used to show "no listing" calibrations as "ALL" for transmission type but I worked in the dealership and I knew for a fact it was wrong sometimes. So when I wrote BCCFind I made sure it showed "All / No Listing" to indicate there was no specific data for trans type. The final check of course is to look at the cal in Tunerpro and see what options are selected. Greg reported the "manual trans" bit was not set on the trans he found which confirms auto trans.

    16156930 PCM superceded to 16197427 with a brief time as a 16196395. GM did a flurrry of part number changes early on and IIRC they had a bulletin out regarding the changes. When there are a lot of quick changes like that I always suspected they'd found internal problems and worked them out during production or had a major vendor change and wanted to track the parts. But you did raise a good point. I need to go back through my search using the 6930 part number to see what comes up.

  4. #4
    Fuel Injected! gregs78cam's Avatar
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    I just got back from Pull&Save and got two Manual Trans PCMs, one for V6 '7427 one for V6 '6395. Here they are.


    EDIT: Mark you are right, that one did have a V6 in it, sorry. will repost .bin
    Attached Files Attached Files
    Last edited by gregs78cam; 02-08-2012 at 05:06 PM.
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

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    EFI GearHead ! EagleMark's Avatar
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    Well aren't you cool?

    But CalData says BJFC is for 4.3 and BDXS was superceded to BJFC both 16196395 so the more we learn about manual BCC for these PCM the more I get confused?


    EDIT: Hex says OD spark says six cylinder but manual transmission is checked! Woo Hoo! Should be able to use this with change to 8 cylinder and cylinder volume changed?

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  6. #6
    EFI GearHead ! EagleMark's Avatar
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    BCC result page!



    BCC used in 1994. (Scroll down for more info)






    BCC= BJFC7466

    Scan id= 7465

    Part number= 16197464



    Release date= 01/31/94

    Engine size= 4.3

    Trans Type= Manual trans



    ECM/PCM: PCM #16196395


    Used in trucks:


    GMC

    Possibly used in:


    C1500,2WD,1/2 TON

    C1500,2WD,1/2 TON

    C2500,2WD,3/4 TON








    C2500,2WD,3/4 TON

    K1500,4WD,1/2 TON

    K1500,4WD,1/2 TON








    K2500,4WD,3/4 TON

    K2500,4WD,3/4 TON





    Options:



    With LB4 4.3L GAS (4.3Z) V6




    With MT8 MAN 5 SPD NEW PROCESS 109MM 6.34




    Without NM8 EMISSION SYSTEM, LEADED FUEL

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  7. #7
    Fuel Injected! JeepsAndGuns's Avatar
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    Quote Originally Posted by 1project2many View Post
    Manual transmission trucks with 5.0 / 5.7 came with a C3 ECM. There are three numbers, 16156480, 16196396 or 16171199.

    BJYN is not a manual transmission calibration. BJYN is a G van calibration and G vans were not available with a manual transmission. The database has M for manual, A for auto, or sometimes it has nothing at all. GM's own software used to show "no listing" calibrations as "ALL" for transmission type but I worked in the dealership and I knew for a fact it was wrong sometimes. So when I wrote BCCFind I made sure it showed "All / No Listing" to indicate there was no specific data for trans type. The final check of course is to look at the cal in Tunerpro and see what options are selected. Greg reported the "manual trans" bit was not set on the trans he found which confirms auto trans.

    16156930 PCM superceded to 16197427 with a brief time as a 16196395. GM did a flurrry of part number changes early on and IIRC they had a bulletin out regarding the changes. When there are a lot of quick changes like that I always suspected they'd found internal problems and worked them out during production or had a major vendor change and wanted to track the parts. But you did raise a good point. I need to go back through my search using the 6930 part number to see what comes up.
    What code mask did those manual trans ecm's use, $0D?

    So your saying the manual trans truck started out with 16156480, 16196396, 16171199, or 16156930, and then switched to the 16196395, and then finally all (manual and auto) switched to using the 7427?
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  8. #8
    Fuel Injected! gregs78cam's Avatar
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    What I find interesting is that the "Stall Saver Activation Thresholds" bit is not set, and the "TCC Only" bit is set.
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

  9. #9
    EFI GearHead ! EagleMark's Avatar
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    Yes they are both $OD.

    But manual bit is set! May use something completly differant for Stall saver. Later when I find time..... been an issue lately.... I want to compare it to auto and see how many differences I can find to IAC logic, decel settings and such...

    Manual bit is set so who knows what why TCC only is set, maybe over ride... who cares I got an $OD manual bin!

    I could always set it identical to $OE manual bin that needs changes from 7.4L to 5.7L, this one needs to go from 4.3L to 5.7L. The other one is listed as 5.7L all trans and it may be best start with manual bit checked?

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  10. #10
    Fuel Injected! gregs78cam's Avatar
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    Just remember to compare them both from V6s

    Quote Originally Posted by EagleMark View Post
    Yes they are both $OD.

    .... I want to compare it to auto and see how many differences I can find to IAC logic, decel settings and such...
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

  11. #11
    Vintage Methane Ejector
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    Need to check for CPI as well.

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