What rear axle ratio was original to your 40th. If a 3.07 you should have the correct VSS and a single gear 'might' do correction. If other than a 3.07 the correct VSS is a very hard find.

 

I had the 2.59 "Cadillac" rear end according to the build-sheet on my glove box. EM listed a 3.54 speedo adjust gear, so I ordered it. I'm a newbie, what do you mean by VSS? I thought the rotation of the gear sent the wheel-speed info to the digital device running the speedo--am I wrong?

Ronn

 

You should need a drive 15 tooth, a VSS and a 42 or 43 tooth driven. You currently likely have 17 drive and a 35 for driven along with the incorrect VSS.

 

I have both ........greg

 

So, if I understand correctly, the gear alone is not helpful. Am I better off returning it and just getting an electronic unit like the abbot--accepting odometer error?

Thanks

R

 

I would think so unless you were able to come up with the correct VSS. That's very unlikely to happen. The ERA I'd think is currently a more reasonable approach. What exactly were you sold and how many $$$. EM wasn't/isn't known for 'deals'!!

 

I got this- calibrated to 3.54 gears

 

Thanks, I'm leaning towards drag radials, just want to do some research on how hard that would be on my dana 36 if the rear end would hold up to that. Need warm weather first

John

 

You would need a correct VSS to use those. An original GM # would be 10456092. Your electrical connector currently is likely 'white'!

 

Hi, I thought about the gears and vehicle speed sensor, I believe mine for the 3:73 was going 15 and a 45, which is from what I heard hard to find. I decided to do the ERA because wasn't sure I was going to stay with 17" rims, just thought it would make it a little more flexible. Thanks for the info.
John

 

Just everything I ever wanted to now right here. Great thread. Not to change topics here but my question. For a 93 NoN E 4l60 this no tuning the ecu. Just out of curiosity would just changing the torque converter not accomplish the same kind of result? You guys are probably not aware the gen6 camaros don't have a gear set upgrade option the ring gears are welded on. Not much out there yet. They are all doing TC swaps and get major results that way. Wouldn't doing a TC swaps on my example maybe do the same kind of thing with off the line acceleration? I smoke my 11"s on the 2.59 as it is. Just curious for comments. Thank guys.

 

Interesting question, I'll have to get back to you after I research this a little more, I'll be taking my car for another ride this weekend. our you saying you already did this, is your LT1 stock. What was the cost and the spec's of your new TC, how's the car drive now compared to before the change, any down fall from changing TC, as I've stated before I'm not a good mechanic but have 2 buddies suited for this question they both have really fast cars.

John

 

No. Wasn't meant to rain on any parades! I just took the opportunity to look in this thread because it's specific to my car, the 93.. This taught me about the speedo gear and the sensor issue. So it clicked with me that coming from Gen5/6 GM I had some more background I could suggest, besides having to rely on finding parts sources for the gear/ sensor issue. The Gen5/6 rear swaps are far less common than TC swaps because of the welded diff. They are claiming good results, I suppose being another option, its a good thing. I have the typical long second gear and would think a little gearing bump would help also like the 3.07 but now I see the calibration issues its a lot to think about. I looked to find something over at gen5 that might show you with out suggesting you have to a lot of reading over there, but if you do its camaro5.com/forums. same stuff, TCs, longtubes, cams, intakes, prochargers, etc, but diff swaps are rare. They have the benefit of 6 gears so the TC would be more of a factor there, I suppose. We need more gears and sensors!

 

gears are like French fries—more is always better😉

 

Have not got into the whole torque converter deal, my thing is I don't want to be to tuff on my dana 36, trying to keep sudden shock at a minimum. I did order a abbott era to day from Bobs Speedometer, $155.00 plus shipping was the best deal I could find. 1-800-592-9673

John

 

costs the same as the dakota digital box. except the dakota digital boxes are much more versatile

 

Following up on Bill, it would seem the 100BT unit is all one would need, and it's 1/2 the price. Anyone used this or know if this is the correct unit for '93 speedo correction for a 2.59 to 3.55 swap-- which I'll need in about a week?
https://www.summitracing.com/parts/d...caAsmyEALw_wcB

or this slightly more expensive, unit (which won't ship for 3 months, so...)
https://www.summitracing.com/parts/p...9124?rrec=true

Thanks

R

 

your going to like your gear change, really like my 3.73. went with the abbott ERA found more positive information on it, this week where going to try to get it installed will update on progress

 

Reviving an old thread: I have my 3.54 gears in plus the abbot ERA for the speedo, and I can't get anywhere near the correct speedo reading following their chart. Now, I didn't install the unit, the fellow who did my gears did--so maybe install error, but I doubt it. The calculator on the site says I need a 1.7 adjustment, which gets me about 20MPH shy of 60. So I tried starting at 1.65 and walked through to 1.75 and I got everything from 2MPH indicated at an actual 60MPH to 200 at an actual 60MPH-- no rhythm or reason; i.e. there was no linear progression. It's just crazy. I went from 2.59 to 3.54 maintaining the same wheel size--this shouldn't be this hard. And their directions??? I'm gonna just suppose 0= "off" means the toggle is down (like on my garage opener) because the instructions are silent. Likewise, aside from the top 12 or so toggles, there are 4 on the bottom--first oners up but again NO explanation as to why. The bottom toggles aren't even mentioned in the directions. When the car is running I have a red LED light on in the unit--should it be another color--instructions don't even mention light, let alone the color.

I'm gonna give them a ring tomorrow, but I was just wondering if anyone here has used one of these a 4L60 (NOT E) auto? I generally assume I'm missing something obvious, which I kind of hope so (as I've spent too much time on this already to have to be fussing with sending defective units back.)

On a brighter note: 3.54 gears are an AMAZING difference!

Ronn

 

Where is it installed in the car? You'll have a much better 'conversation' with them if you can assure them it's wired correctly. I wouldn't bother them with a call if you don't know!

**** Post #42 hints it might be wise to confirm all of this before 'the call'!