Dana 300 vs NP203

blazerbrad · 10-26-2009, 10:14 AM

If it's a factory TH350/203 combo than it will be passenger side drop. The 203 only has a 2:1 low range and is a full-time case from the factory so no 2wd mode unless it's been converted (which was pretty common).

Personally I would prefer to go the 300 route.

Many people use the 203 range box that contains the 2:1 planetary for a doubler. A guy in our club has a TH350/203 range box/300 in his Samurai. It is stretched in the back but not an abnormal amount to fit, but it is supre tight. Based on that you could get it to work, but it's a lot more work and money for something that I'm not really sure you need.

boomhauer · 10-27-2009, 10:04 AM

just remember that the 203 is a chain driven pig. i always make a point to stay away from chain driven cases when it comes to offroad use. one broken tooth can/will ruin a good day in the woods !

FollowMyRuts · 10-27-2009, 10:44 AM

Quote:

Originally Posted by boomhauer

just remember that the 203 is a chain driven pig. i always make a point to stay away from chain driven cases when it comes to offroad use. one broken tooth can/will ruin a good day in the woods !

Thats kinda what i was thinking. but god thoughs adapters are friggin expensive! lol

blazerbrad · 10-27-2009, 11:51 AM

You are not going to break a 203 in a Jeep. The only issue I have ever seen is that after a lot of miles the chain gets worn and sloppy and starts slipping. Keep in mind these cases were designed to go into 3/4 and 1 ton trucks.

FollowMyRuts · 11-02-2009, 07:40 PM

well, he guy apparently doesnt have the transmission anymore, soo im back to square one, looking for a TH350 tranny to mate up my Dana300 or if i can find a TH350 with a t-case... anyways, thanks for the advise guys!!

KargoMaster · 11-07-2009, 08:06 PM

Better late than never....

203 vs. 300... ...BOTH!

Below is my NP435 trans with an NP203 (low range gearbox) in a Chevy variety, flipped upside down, with a 23 spl Dodge input gear in it... with Dana 300 bringing up the rear...

(T-150 looks sooooo small next to this)

By the way, if I had to do it over, I'd have bought a STaK... but the doubler should provide me with hours of shifting entertainment...

gothodgie · 11-07-2009, 11:20 PM

Quote:

Originally Posted by KargoMaster

Better late than never....

203 vs. 300... ...BOTH!

Below is my NP435 trans with an NP203 (low range gearbox) in a Chevy variety, flipped upside down, with a 23 spl Dodge input gear in it... with Dana 300 bringing up the rear...

(T-150 looks sooooo small next to this)

By the way, if I had to do it over, I'd have bought a STaK... but the doubler should provide me with hours of shifting entertainment...

very nice setup... what is the 1st gear ratio on the np435 ?

10-27-2009, 10:04 AM	#2
boomhauer Join Date: Mar 2008 Posts: 188	just remember that the 203 is a chain driven pig. i always make a point to stay away from chain driven cases when it comes to offroad use. one broken tooth can/will ruin a good day in the woods ! __________________ 95 yj, fresh fuel injected 302, c-6, twin sticked 205, 3 linked high pinion d60 front, double trianulated 4 linked 14 bolt rear (all aluminum links) locked both ends, 4:56 gears, full hydro steering, high steer, 4 wheel discs, 16" 2.5 fox air shocks, 39.5" irok's. just finishing a full frame-up redo thanks to a great friend and one knowledgable(sp?) s.o.b casey cravens for without him this could not have been done in such a short time and done right! LOOK OUT "WHITEY" HERE I COME!!!

11-07-2009, 08:06 PM	#6
KargoMaster Cleaning off the rust... Join Date: Jan 2007 Location: Cincinnati, OH Posts: 1,009	Better late than never.... 203 vs. 300... ...BOTH! Below is my NP435 trans with an NP203 (low range gearbox) in a Chevy variety, flipped upside down, with a 23 spl Dodge input gear in it... with Dana 300 bringing up the rear... (T-150 looks sooooo small next to this) By the way, if I had to do it over, I'd have bought a STaK... but the doubler should provide me with hours of shifting entertainment... __________________ brad 5.0L \| 435 \| 203 \| 300 \| 4.10 \| 39.5 Buildup BACK underway...

10-26-2009, 10:14 AM	#1
blazerbrad - CORE Member - Join Date: Feb 2007 Posts: 831 Images: 6	If it's a factory TH350/203 combo than it will be passenger side drop. The 203 only has a 2:1 low range and is a full-time case from the factory so no 2wd mode unless it's been converted (which was pretty common). Personally I would prefer to go the 300 route. Many people use the 203 range box that contains the 2:1 planetary for a doubler. A guy in our club has a TH350/203 range box/300 in his Samurai. It is stretched in the back but not an abnormal amount to fit, but it is supre tight. Based on that you could get it to work, but it's a lot more work and money for something that I'm not really sure you need.

10-27-2009, 11:51 AM	#4
blazerbrad - CORE Member - Join Date: Feb 2007 Posts: 831 Images: 6	You are not going to break a 203 in a Jeep. The only issue I have ever seen is that after a lot of miles the chain gets worn and sloppy and starts slipping. Keep in mind these cases were designed to go into 3/4 and 1 ton trucks.

11-02-2009, 07:40 PM	#5
FollowMyRuts That Guy Join Date: Sep 2009 Location: Hamilton OH Posts: 23	well, he guy apparently doesnt have the transmission anymore, soo im back to square one, looking for a TH350 tranny to mate up my Dana300 or if i can find a TH350 with a t-case... anyways, thanks for the advise guys!!