transmissions:4t65e
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| transmissions:4t65e [2020/03/27 00:27] – ben | transmissions:4t65e [2020/05/09 20:51] (current) – ben | ||
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| - | ==== 4T65e / 4T65e-HD ==== | + | ====== 4T65e / 4T65e-HD |
| - | The 4T65e and 4T65e-HD are the exact same transmission internally and externally. The only difference between the two is that the HD version has a stronger differential. | + | The 4T65e and 4T65e-HD are the exact same transmission internally and externally. The only difference between the two is that the HD version has a stronger differential.\\ |
| + | {{ : | ||
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| - | {{ : | + | This transmission was by far the most common transmission that was bolted to the 3800 from the factory.\\ |
| + | It is generally considered to be the achilles heel of the 3800 world since it is one of the reasons why the 3800 engine doesn' | ||
| ==== Details and History ==== | ==== Details and History ==== | ||
| - | ==== | + | === The 4T65e is a 4 speed automatic transmission designed for front wheel drive vehicles from GM. === |
| It is rated for vehicles up to 6,500 lbs and engines producing up to 280 ft. lbs. of torque. | It is rated for vehicles up to 6,500 lbs and engines producing up to 280 ft. lbs. of torque. | ||
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| Typically the clutches and other internals will last for quite a long time. Usually replacing the solenoids will allow the transmission to last quite a bit longer without doing a full rebuild. | Typically the clutches and other internals will last for quite a long time. Usually replacing the solenoids will allow the transmission to last quite a bit longer without doing a full rebuild. | ||
| - | The only hard part that tends to wear out is the 4th gear clutch shaft. This shaft is a very small shaft on the end with a high spline count. Higher mileage vehicles will start to see the splines become thinner over time until eventually the splines are no longer there. \\ | + | The only hard part that tends to wear out is the 4th gear clutch shaft. This shaft is a very small shaft on the end with a high spline count. Higher mileage vehicles will start to see the splines become thinner over time until eventually the splines are no longer there.\\ |
| - | {{ : | + | {{ : |
| \\ | \\ | ||
| This issue will typically only result in the loss of 4th gear however with no other oddities associated with it. | This issue will typically only result in the loss of 4th gear however with no other oddities associated with it. | ||
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| **Around the 300 horsepower mark** the input shaft and drive chains will typically break. These two parts will typically break around this same power level depending on the car.\\ | **Around the 300 horsepower mark** the input shaft and drive chains will typically break. These two parts will typically break around this same power level depending on the car.\\ | ||
| - | There are aftermarket input shafts available to resolve this issue. ZZP offers a 300m input shaft that they have rated to handle 1,000 horsepower, and a 4340 input shaft to handle up to 600 horsepower. | + | \\ |
| + | There are aftermarket input shafts available to resolve this issue. ZZP offers a 300m input shaft that they have rated to handle 1,000 horsepower, and a 4340 input shaft to handle up to 600 horsepower. Most who have used these input shafts will claim that a 4340 input shaft doesn' | ||
| + | The 300m input shaft seems to have been able to handle significantly more power. There is a difference in 300m input shafts though, some have a groove cut into them and others do not. The stronger one is the one that is " | ||
| There are fewer drive chain alternatives available however that are considered to be strong. The easiest upgrade that seems to have become more popular lately is to utilize the hardened chains from the Grand Prix GXP. It's not clear where the power limit is on this chain yet.\\ | There are fewer drive chain alternatives available however that are considered to be strong. The easiest upgrade that seems to have become more popular lately is to utilize the hardened chains from the Grand Prix GXP. It's not clear where the power limit is on this chain yet.\\ | ||
| There is also a sing 7/8" chain available to replace the factory dual chains, however there are reports that this chain is not as strong as it should be for its size. This will however still be stronger than the factory chain.\\ | There is also a sing 7/8" chain available to replace the factory dual chains, however there are reports that this chain is not as strong as it should be for its size. This will however still be stronger than the factory chain.\\ | ||
| The strongest chain available is the 1" wide GM Racing chain. This chain however is becoming increasingly hard to find. Those who have this chain have been asking quite exorbitant price tags because of its strength and rarity. | The strongest chain available is the 1" wide GM Racing chain. This chain however is becoming increasingly hard to find. Those who have this chain have been asking quite exorbitant price tags because of its strength and rarity. | ||
| + | |||
| + | **After 300 horsepower..** | ||
| After those two issues have been sorted out, the next parts that might break would be the output shaft as well as the pump shaft. Both of these have strong replacement parts available from 3800 parts vendors such as ZZP. | After those two issues have been sorted out, the next parts that might break would be the output shaft as well as the pump shaft. Both of these have strong replacement parts available from 3800 parts vendors such as ZZP. | ||
transmissions/4t65e.1585268839.txt.gz · Last modified: 2020/03/27 00:27 by ben