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I can assure you that's incorrect!!! A 'gray' drive might snapshot as 'white' but I didn't recall the gray being that light!! Your 'green' gear I'm quite sure will have a 42 on it!!
If you used your old VSS and it has 10456091 ( OE for a D36 & 2.59) stamped on it, that's what started your situation. If your VSS wasn't original post the info like you were asked several days ago. Does your console lid SPID mention D8K?
I can assure you that's incorrect!!! A 'gray' drive might snapshot as 'white' but I didn't recall the gray being that light!! Your 'green' gear I'm quite sure will have a 42 on it!!
If you used your old VSS and it has 10456091 ( OE for a D36 & 2.59) stamped on it, that's what started your situation. If your VSS wasn't original post the info like you were asked several days ago. Does your console lid SPID mention D8K?
Thanks for your help WVZR and sorry for the delays in getting proper responses. I was on the road this afternoon. So to answer a few of your questions I can't verify drive gear color yet as the car is off of jack stands... I'll have to get at it again tomorrow and check). Here you go:
Replaced D36 with 3.45 D44
VSS is original equipment. Rear gearing from factory (C4 base auto) was 2.59 Dana 36
The green gear has two "4"s stamped inside 180 from each other across the axis. See photo below.
I cannot confirm color of the drive gear however it looked snow white when I viewed with an LED light. Can I remove to check without major tail section disassembly?
THERE IS A HIGH LIKELIHOOD that you are absolutely correct and the gearing in not correct. I purchased the change gear set from one of the equipment suppliers I used in acquiring parts. The gears were new and I believe they were purchased through Exotic Muscle which were supposed to be the correct combo for a D44 3.45
The REAR TIRE size is P315/35ZR17
Any help you can provide in helping me determine what gears I actually need would be quite helpful. Thanks again.
Difficult to see but for reference... you will need to zoom if possible Difficult to see but for reference... you will need to zoom if possible
I can assure you that's incorrect!!! A 'gray' drive might snapshot as 'white' but I didn't recall the gray being that light!! Your 'green' gear I'm quite sure will have a 42 on it!!
If you used your old VSS and it has 10456091 ( OE for a D36 & 2.59) stamped on it, that's what started your situation. If your VSS wasn't original post the info like you were asked several days ago. Does your console lid SPID mention D8K?
As for console LID (this build has certainly been a great learning experience)... yes, there is D8K indicated
I can assure you that's incorrect!!! A 'gray' drive might snapshot as 'white' but I didn't recall the gray being that light!! Your 'green' gear I'm quite sure will have a 42 on it!!
If you used your old VSS and it has 10456091 ( OE for a D36 & 2.59) stamped on it, that's what started your situation. If your VSS wasn't original post the info like you were asked several days ago. Does your console lid SPID mention D8K?
Again... I bought the speedo gear set from EM (below). I can call them on Monday to check into gear set that was sent.
As member WVZR-1 has outlined and is spot on "If you used your old VSS and it has 10456091 ( OE for a D36 & 2.59) stamped on it, that's what started your situation"
I believe you need to use VSS 10456089 .
Glad you found the issue and should be a straight forward repair to get you going again.
As member WVZR-1 has outlined and is spot on "If you used your old VSS and it has 10456091 ( OE for a D36 & 2.59) stamped on it, that's what started your situation"
I believe you need to use VSS 10456089 .
Glad you found the issue and should be a straight forward repair to get you going again.
That ain't necessarily a 'fix' - that's actually for an M6 and I 'don't know' (because I've never had a reason to try) but I suspect that the 4L60 extension would require likely a massage for it to work. A 4L60 for 40+ is fabricated like this. See post #13 for the 4L60 extension.
OP - first needs to confirm what the drive is he's got in the build!
That ain't necessarily a 'fix' - that's actually for an M6 and I 'don't know' (because I've never had a reason to try) but I suspect that the 4L60 extension would require likely a massage for it to work. A 4L60 for 40+ is fabricated like this. See post #13 for the 4L60 extension.
OP - first needs to confirm what the drive is he's got in the build!
so with the exception of having to double check / confirm drive gear, I need to order the correct VSS. Not an easy task finding. I do see Eckler’s Corvette has the 25-160093-1 which is the OE 10456089 equivalent. My research shows the only difference between the 10456089 and 10456091 is the offset positioning of the driven gear. So... I would imagine that the M6 spec will work. I imagine I’m certainly not the first to swap the Dana 36 to a 44.
so with the exception of having to double check / confirm drive gear, I need to order the correct VSS. Not an easy task finding. I do see Eckler’s Corvette has the 25-160093-1 which is the OE 10456089 equivalent. My research shows the only difference between the 10456089 and 10456091 is the offset positioning of the driven gear. So... I would imagine that the M6 spec will work. I imagine I’m certainly not the first to swap the Dana 36 to a 44.
I'd buy nothing until you confirmed!!! You should be able to purchase the 10456089 or an equivalent locally. I'll provide you a couple possible equivalents. .
I'd buy nothing until you confirmed!!! You should be able to purchase the 10456089 or an equivalent locally. I'll provide you a couple possible equivalents. .
Ok guys. I confirmed that the driven Green gear is. 42 tooth gear (marked and counted). Also, the drive gear does appear to be light grey (thanks to lighted camera probe). Now... it’s a matter of confirming and sourcing the VSS.
If you'd like to try the 10456089 - the last few I've bought came from NAPA - VSS207. I've not bought recently but that's where I might start OR AC Delco might likely have some old stock or maybe even some dealerships ACD 213-198, GM 10456089.
The transmission in your car now is the original and 'just been built' using the original as a core?
The fact that the builder was able to get it installed the first time you might want to make sure the drive gear is in the correct location. The 4L60 has two bores for retainer clip/drive gear locating, I'm pretty confident Corvette uses the most rearward. You might be able to rotate the driveshaft and actually observe which is open. I've never looked!!!!
There's maybe other VSS possibilities that could/might work but they're maybe more difficult finds.
FORCE NOTHING!!!! If you end up having to 'massage' the extension housing take snapshots.
If you'd like to try the 10456089 - the last few I've bought came from NAPA - VSS207. I've not bought recently but that's where I might start OR AC Delco might likely have some old stock or maybe even some dealerships ACD 213-198, GM 10456089.
The transmission in your car now is the original and 'just been built' using the original as a core?
The fact that the builder was able to get it installed the first time you might want to make sure the drive gear is in the correct location. The 4L60 has two bores for retainer clip/drive gear locating, I'm pretty confident Corvette uses the most rearward. You might be able to rotate the driveshaft and actually observe which is open. I've never looked!!!!
There's maybe other VSS possibilities that could/might work but they're maybe more difficult finds.
FORCE NOTHING!!!! If you end up having to 'massage' the extension housing take snapshots.
The Tranny is the original core. I watched a video on the retainer positioning and two holes. The retainer needs to register in the hole nearest the front of the tranny so I will try to check that. I will also try to verify that the drive gear is centered in the VSS opening (another way to validate retainer position. I saw the NAPA part earlier and will call tomorrow. Most options are special order but I’ll find one. I imagine the M6 version will work brings the only difference is the gear offset to allow for the larger tooth driven gears associated with the D44. Will let you know how it goes.
The Tranny is the original core. I watched a video on the retainer positioning and two holes. The retainer needs to register in the hole nearest the front of the tranny so I will try to check that. I will also try to verify that the drive gear is centered in the VSS opening (another way to validate retainer position. I saw the NAPA part earlier and will call tomorrow. Most options are special order but I’ll find one. I imagine the M6 version will work brings the only difference is the gear offset to allow for the larger tooth driven gears associated with the D44. Will let you know how it goes.
Ok... taking in everyone’s help and researching, I was able to find a post documenting the same gearing change, speedo gear changes without the VSS change and a broken shaft. Same outcome!! The answer is. As indicated by the senior members helping me learn, the VSS, drive gear and driven gear must be changed. For reference I’ve copied in a link to the forum and thread I’m referring to.
Ok... taking in everyone’s help and researching, I was able to find a post documenting the same gearing change, speedo gear changes without the VSS change and a broken shaft. Same outcome!! The answer is. As indicated by the senior members helping me learn, the VSS, drive gear and driven gear must be changed. For reference I’ve copied in a link to the forum and thread I’m referring to.
thanks to all... I’ll be sourcing the M6 VSS this week which is the correct choice for the 3.xx gearing.
ASSUME NOTHING!! FORCE NOTHING!! By actual application the VSS isn't correct for a driven gear that's 40+ in an A4!! That's info and an experience that's well over 18 years old!!
ASSUME NOTHING!! FORCE NOTHING!! By actual application the VSS isn't correct for a driven gear that's 40+ in an A4!! That's info and an experience that's well over 18 years old!!
Wise advice which I will take care to follow. As I’m going through the deduction process. I’m assuming that the VSS shaft must not be concentric with the VSS port??? Perhaps that’s why the orientation of the VSS and the VSS support is important and why some have tried flipping the mounting 180 degrees. For me, you have a drive gear which has a fixed diameter, a mounting port which doesn’t change. The physical variables include the diameter of the driven gear and the concentricity or offset of the VSS shaft. I can’t think of any other variables?? Will let everyone know how it turns out.
Wise advice which I will take care to follow. As I’m going through the deduction process. I’m assuming that the VSS shaft must not be concentric with the VSS port??? Perhaps that’s why the orientation of the VSS and the VSS support is important and why some have tried flipping the mounting 180 degrees. For me, you have a drive gear which has a fixed diameter, a mounting port which doesn’t change. The physical variables include the diameter of the driven gear and the concentricity or offset of the VSS shaft. I can’t think of any other variables?? Will let everyone know how it turns out.
AND... can’t wait to get back to fine tuning the beast!
