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New to the site but not new to wrenching

9

92burb

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I have a 92 k2500 Suburban 7.4L 4x4 3/4 ton. I'm having issues with the 4l80 transmission. It's making a whining noise at slightly open throttle at low cruising speeds (30-50). Any help is greatly appreciated. If anyone knows of a manual transmission swap that's bolt in ... any advice would be nice. Thanks
 
Welcome to the forum @92burb Marty is correct and has you on the right first steps. drop the pan and do a fluid and filter change with ONLY dex III. iirc Valvoline is the only one left that still sells real dex 3. GM will tell you dex 6 supersedes the older fluids but many will tell you that dex 6 is thinner and changes in viscosity when heated.

how many miles are on the trans and what does the fluid smell and look like? do you know when it was last serviced? other than the whine sounds it's making, how does it feel driving and when it shifts? do you tow anything?
 
A NV4500 is a direct bolt in. Granted you'll have to add a clutch pedal and master cylinder but all the dimples are in the firewall for drilling out and converting.

You'll want a GM NV4500, the dodge has a different size input shaft and different output spline count.

There's two GM NV4500 bellhousings, 92-95 used an external slave cylinder and clutch for while 96+ used an internal slave. The bellhousings are different. They also are not interchangeable between the early and later years. The early 92-95 GM NV4500 transmissions have their own unique bolt pattern to connect to the bellhousing. So a 92-95 transmission won't directly bolt to a 96+ bellhousing and vice versa

The 96+ GM NV4500 transmissions have the same trans to bellhousing bolt patterns as the dodge NV4500 transmissions, but you would still have to change the input shafts, input shaft retainer, and output shafts on the Dodge transmission to make it work in a GM/ Chevy.

So long story short, a GM NV4500 is your manual to swap in but make sure to get the correct bellhousing with the transmission
 
another tip... I will get this one out of the way now... if you end up needing another trans / rebuild. what ever you do, do NOT allow a shop swap or exchange your trans for another one. this age of trans there are things in it that are NLA and won't be present in an exchange unit. find you a reputable trans shop that will take YOURS and do a full rebuild along with any upgrades you want. you will thank your self for this later down the road.
 
DieselAmateur said:
A NV4500 is a direct bolt in. Granted you'll have to add a clutch pedal and master cylinder but all the dimples are in the firewall for drilling out and converting.

You'll want a GM NV4500, the dodge has a different size input shaft and different output spline count.

There's two GM NV4500 bellhousings, 92-95 used an external slave cylinder and clutch for while 96+ used an internal slave. The bellhousings are different. They also are not interchangeable between the early and later years. The early 92-95 GM NV4500 transmissions have their own unique bolt pattern to connect to the bellhousing. So a 92-95 transmission won't directly bolt to a 96+ bellhousing and vice versa

The 96+ GM NV4500 transmissions have the same trans to bellhousing bolt patterns as the dodge NV4500 transmissions, but you would still have to change the input shafts, input shaft retainer, and output shafts on the Dodge transmission to make it work in a GM/ Chevy.

So long story short, a GM NV4500 is your manual to swap in but make sure to get the correct bellhousing with the transmission
Click to expand...
On the use of a Dodge transmission. Correct Me if I am wrong and a Dodge transmission is totally incompatible with use in a GM application.
In another larger city to the west of where I live, there is a clutch rebuilding service. “ Clutch Masters “.
If there is such a service near You then they can fit a clutch disc to whatever build You would want to use.
Before they rebuild a clutch, they ask several questions so that they get You a remanufactured clutch that matches what ever type of driving You do.
When clutch masters rebuilt the clutch for My 1959 Dodge W100, one question he asked is, are You ever in situations where You have a need to ride the clutch ?
Yes, the 59 is used in situations such as that. There is a 6,000 pound winch mounted to the front of the bed, that winch is used to power a set of gin poles for lifting and gently placing items, engines and such, and thats when the clutch pedal is feathered to jokey the truck into such positions.
Not an issue with a automatic transmission.
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@MrMarty51 the only incompatibilities of a Dodge vs GM NV4500 that I'm aware of are the differences in input and output shafts as described above. In addition to the input shafts being different diameters I think the lengths are different too. So getting a custom clutch disc wouldn't change the fact that the input of the Dodge won't fit the pilot bearing on the GM crank or mate up properly between the bellhousing and engine.

I'm glad you're able to keep that '59 going, awesome piece of history there!
 
DieselAmateur said:
@MrMarty51 the only incompatibilities of a Dodge vs GM NV4500 that I'm aware of are the differences in input and output shafts as described above. In addition to the input shafts being different diameters I think the lengths are different too. So getting a custom clutch disc wouldn't change the fact that the input of the Dodge won't fit the pilot bearing on the GM crank or mate up properly between the bellhousing and engine.

I'm glad you're able to keep that '59 going, awesome piece of history there!
Click to expand...
Full mechanical restoration.
Maybe, someday, it might get a paint job.
I’m not a huge fan of rusty patina.
 
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