6395 7427 8625 Manual Trans Calibration Listing

[UglyBoost91]

MT8 with a V6??? That's the RPO for the NV4500 in 3/4 and 1 tons...

I have actually seen this combination in the wild at a junkyard! It was an old 1994? fleet order truck for a power company. 3/4 Ton, 8 lug wheels, TBI 4.3L V6, and an NV4500 in all of it's huge cast-iron glory. I never would have believed it seeing the 5 speed shift knob, figured it was a T5 or, even a SM465 with the wrong knob, but sure enough; I crawled underneath it and it was an NV4500!

Truck was for sure all factory built this way, I was REALLY stupid for not snapping a picture of the BCC sheet and grabbing the PROM...

[woody80z28]

I have actually seen this combination in the wild at a junkyard! It was an old 1994? fleet order truck for a power company. 3/4 Ton, 8 lug wheels, TBI 4.3L V6, and an NV4500 in all of it's huge cast-iron glory. I never would have believed it seeing the 5 speed shift knob, figured it was a T5 or, even a SM465 with the wrong knob, but sure enough; I crawled underneath it and it was an NV4500!

Truck was for sure all factory built this way, I was REALLY stupid for not snapping a picture of the BCC sheet and grabbing the PROM...

Wow, that blows my mind. Think of all the inertia that poor 4.3 had to spin. haha

[c5wagner]

I just pulled an nv4500 out of a 4.3l tbi retired construction company truck this past weekend at the pick and pull, using the nv4500 for an upcoming project. Pulled the chip too for the heck of it and it was a 95 BJWT, on BCC lookup it was supposed to be an MG5 manual......

[In-Tech]

Sweet, and it is a 0D mask. Years ago I converted a 95 truck whipplecharged that had the BS 2732a chip 5 spd into a red/blue 7427. Man what a treat it would have been to have had THIS file to start with. Thanks for sharing.

[c5wagner]

Sweet, and it is a 0D mask. Years ago I converted a 95 truck whipplecharged that had the BS 2732a chip 5 spd into a red/blue 7427. Man what a treat it would have been to have had THIS file to start with. Thanks for sharing.

Yes, it was $0D from a 16197427 PCM... But like I mentioned earlier, the BCC lookup showed a different manual trans than the nv4500........

[1project2many]

BJWT is listed as an MG5 light duty five speed transmission calibration. The gear ratios stored in the cal are 4.0, 2.3, 1.4, and .9 which are closer to the MG5 / HM290's ratios of 4.016, 2.318, 1.401, and 1.00:1 than the MT8/NV4500's 6.34, 3.44, 1.71, and 1.00. I would guess the NV4500 was retrofitted after the, umm, fine piece of engineering that was the HM290 grenaded.

[woody80z28]

BJWT is listed as an MG5 light duty five speed transmission calibration. The gear ratios stored in the cal are 4.0, 2.3, 1.4, and .9 which are closer to the MG5 / HM290's ratios of 4.016, 2.318, 1.401, and 1.00:1 than the MT8/NV4500's 6.34, 3.44, 1.71, and 1.00. I would guess the NV4500 was retrofitted after the, umm, fine piece of engineering that was the HM290 grenaded.

The bin has gear ratios in it? I'll have to search mine. When I 4l60e to nv4500 swapped I just checked the manual trans flag and that was it...

[1project2many]

First through fourth gear ratios are included in the .bin. In order to make calculations for gear shifts and TCC / Shift Light operation the ECM needs to be able to determine the correct gear. For the old 700R4 or a manual transmission there are not enough switches to tell the ecm every gear the trans is in. The code uses vehicle speed and engine rpm then matches the result to the gear ratios in the table. This table is from a 4L60E/700R4.