how to tell if it is early or late model 99? Truck was recked and built and don't know if they changed the filter assy. that is the only way I know if it is early or late any suggestions????

 

Door sticker should have a built date on it...

 

Might have a manufacture date on a sticker on the valve cover still?

 

Here is a list of differences.
Originally Posted by PaysonPSD
Here are some physical differences:

Credit to Ron aka Ron's Power Stoke

Early 99 has a wicked wheel in it from the factory. And much smaller turbo (spools faster, though)

The early99 has 120cc(AB code) injectors and the late99-03 has 140cc(AD code) injectors.

The early99 has 2" intake runners. The late99-03 has 3" intake runners.

The early99 has a 15* swash plate HPOP. The late99-03 has a 17* swash plate HPOP.

The early99 has one glow plug relay. The late99-03 has one glow plug relay and one air intake heater relay side by side (along with early '99 CA models) . Both relays are on the passenger side valve cover toward the front of the truck.

The early99 has a totally different air filter that is not inter changeable with the late99-03 (except for DRW trucks) . But you can put the late99 air cleaner assembly in the early99 truck. The only three aftermarket air filters that work on the early99 are the AFE stage 2, the AIS and the KWIKK 6637.

The early99 track rod has smaller mounting bolts than the late99-03. (except for DRW trucks)

The early99 has shallower rotors than the late99-03. (except DRW trucks)

The early99 has shorter hub-bearings than the late99-03. (except DRW trucks)

The early99 front axle U bolts are square where they go over the spring pack. The late99 U bolts are round. (except DRW trucks)

The early99 has a different pitman arm than the late99-03. (except DRW trucks)

The early99 does not have the AIH like the late99-03. (except CA model)

The early99 does not have the automatic transmission fluid cooler in the radiator.

The early99 has no indicator light showing that "cruise" is on. Late99-03 has a cruise light that will come on when you set the cruise control. The early99 truck has the light in the dash already. A newer PCM(Yes it will plug in and will run better too) must be used to make the cruise light illuminate. It is a green light on the right side edge, half way up.

 

What's the build date that would define an early or late 99?

 

Early 99's are built before 12/07/98

 

Just curious- although I've heard it a few other times, why would an e99 run better with a 99.5 PCM? Is it just improved programming?

 

wider range for adjustments and a much better shift program in a newer PCM..

 

Thanks guys,The payson article helped the most because I did'nt trll you that there were NO tags on the truck! This info is for a friend and he will thank us.

 

in front of the turbo you will see the intake spider..if you look where the driver side IC pipe mounts too..you can see the early 99 is a funnel shape as it goes into the belly of the spider..the 99.5 and up stay a full 3 inches as it goes into the belly..the boots going into the heads are 2 inches on the early 99 instade of 3inches like the 99.5 and up..in the pic..the 99.5 spider is painted orange...the driver side IC pipe hooks into the leg sticking up and to the right..

 

You should actually be able to get a later model PCM, most desireable is the PMT-1. It is the easiest for the customer tuners to tune, allows them to control more variables compared to older ones.

 

Can you directly swap a later model intake spider and turbo onto a early 99 without doing anything else?

 

Later model intake plenums, 3" boots for spider to plenums,4" intake tube for turbo, turbo pedestal, up-pipes and if I think of anything else I will post.

See my gallery for turbo upgrade.

 

I put the PMT1 in mine but still have no cruise light. Bulb out? Or never installed? How hard to replace?

 

Some people don't get the cruise light for some reason... I did when I put my PMT2 in. Middle of dash on the right side. You could try replacing the bulb, shouldn't be too hard (pull the dash bezel then pull the cluster out).
Robin nailed it on upgrading the intake plenums- you've got to do a complete late style turbo swap.