3.73->4.56 Regear Results
Regeared my truck a few weeks ago. I thought I would start a thread to let people thinking of doing the same what to expect. I've definitely seen the question asked a few times in the past, and o...
Forum Discussion
On your truck, that era had three different fan clutch's available in the after market world
Standard duty, HD duty and "SEVERE" duty. They all have a min of about 15% coupling when not turned fully on by the clutch assembly
When they turn on fully....Standard duty couples a max of around 50% shaft RPMs to the fan blade. HD ups that to around 60%-70% and severe duty couples up to 90% of water pump shaft RPMS....IIRC, but that is the approx range to give you and idea of which you will decide to get
The severe duty clutch ROARs when it kicks in and can see the temp needle drop like a rock.
But...you have a small block 5.7L, so no where near the amount of heat a big block needs to reject. Consider going to electric fans. Get the one sized for a big block (they don't recommend towing with it, but is fine for a small block towing heavy)
Breathing is one of the biggest bangs for the buck on any 90's small block. If you do, make sure to investigate ceramic coating the headers if you don't know of it.
This is the NAPA HD radiator for a big block and will fit your small block engine bay (they are the same between big block and small block). It also referred to as "the short neck", because the ATF internal cooler is larger than the small block radiator (long neck)....got photobucket to work again and hope these image links works...
PS...that is my home made 'reverse flush' kit...
Consider modifying the spark plugs...'cut back' ground electrode. I use copper core...not the platinum they list for my big block
.....this might be too small, but that is the way of photobucket these days...if they don't work...will find time later to fix that
Also, the OEM intake filter box can hold the HD filter. It is about 1-2 inches larger in dia, so more filtering surface area and LESS restriction
Standard duty, HD duty and "SEVERE" duty. They all have a min of about 15% coupling when not turned fully on by the clutch assembly
When they turn on fully....Standard duty couples a max of around 50% shaft RPMs to the fan blade. HD ups that to around 60%-70% and severe duty couples up to 90% of water pump shaft RPMS....IIRC, but that is the approx range to give you and idea of which you will decide to get
The severe duty clutch ROARs when it kicks in and can see the temp needle drop like a rock.
But...you have a small block 5.7L, so no where near the amount of heat a big block needs to reject. Consider going to electric fans. Get the one sized for a big block (they don't recommend towing with it, but is fine for a small block towing heavy)
Breathing is one of the biggest bangs for the buck on any 90's small block. If you do, make sure to investigate ceramic coating the headers if you don't know of it.
This is the NAPA HD radiator for a big block and will fit your small block engine bay (they are the same between big block and small block). It also referred to as "the short neck", because the ATF internal cooler is larger than the small block radiator (long neck)....got photobucket to work again and hope these image links works...
PS...that is my home made 'reverse flush' kit...
Consider modifying the spark plugs...'cut back' ground electrode. I use copper core...not the platinum they list for my big block
.....this might be too small, but that is the way of photobucket these days...if they don't work...will find time later to fix thatAlso, the OEM intake filter box can hold the HD filter. It is about 1-2 inches larger in dia, so more filtering surface area and LESS restriction
