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Replacement Sidewind Gear Kit for Bulldog Jacks

Replacement Sidewind Gear Kit for Bulldog Jacks

Item # BD500106
Our Price: $16.05
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Accessories and Parts BD500106 - Gear Parts - Bulldog
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Replaces the gears for your Bulldog sidewind jacks with up to a 5,000-lb capacity. Also fits Crown jacks with capacites of 2,000 lbs, 3,000 lbs, or 5,000 lbs. Includes all the components needed to replace the gears. 1-800-496-5010 to order Bulldog accessories and parts part number BD500106 or order online at Free expert support on all Bulldog products. Guaranteed Lowest Price and Fastest Shipping for Replacement Sidewind Gear Kit for Bulldog Jacks. Accessories and Parts reviews from real customers.
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  • Reviews (93)
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Bulldog Accessories and Parts - BD500106

  • Camper Jacks
  • Trailer Jack
  • Gear Parts
  • Gears
  • Bulldog

Replaces the gears for your Bulldog sidewind jacks with up to a 5,000-lb capacity. Also fits Crown jacks with capacites of 2,000 lbs, 3,000 lbs, or 5,000 lbs. Includes all the components needed to replace the gears.


  • Replaces the gears for your Bulldog sidewind jacks with up to a 5,000-lb capacity
    • Designed for use with Bulldog 150 Series, 170 Series, and 190 Series jacks
    • Also fits Crown jacks with capacites of 2,000 lbs, 3,000 lbs, or 5,000 lbs
  • Includes all the components needed to replace the gears


  • Overall gear diameter: 1-3/8"
  • Shaft diameter: 1/2"
  • Gear thickness: 45/64"
  • Pin length: 13/16" and 1-1/4"
  • Pin diameter: 3/16"
  • 15 Teeth per gear


  • Bulldog Series 150 jacks: BD155157, BD1550100317, BD1550101344, BD154102, BD150152, and BD1500520317
  • Bulldog Series 170 jacks: BD1700100317, BD1700100301, and BD170205
  • Bulldog Series 190 jacks: BD195356, BD195362, BD195321, BD195351, BD195352, BD195354, BD195368, and BD195369
  • Crown jacks with weight capacity up to 5,000 lbs

Product dimensions

500106 Replacement Side Wind Gear Kit for Bulldog Trailer Jacks

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Customer Reviews

Replacement Sidewind Gear Kit for Bulldog Jacks - BD500106

Average Customer Rating:  4.7 out of 5 stars   (93 Customer Reviews)

Replaces the gears for your Bulldog sidewind jacks with up to a 5,000-lb capacity. Also fits Crown jacks with capacites of 2,000 lbs, 3,000 lbs, or 5,000 lbs. Includes all the components needed to replace the gears.


Sidewind Gear kit does NOT fit Fulton Jack HD50000101. First I placed an order for a Fulton jack that the website says is in stock. Once they bill me they email me to tell me it is not in stock. I place an order for this gear kit and the gear kit does not fit my Fulton Jack. These gears are too thick. Live and learn.

You mentioned that it was not a fit for your Fulton jack. I have a few questions that I would like to ask. What is the weight capacity of your jack?
-- Etrailer Expert Jenny N - 04/27/2022
5000 pounds
-- comment by: Peter - 04/27/2022
Would it be possible to send a picture of the jack? I will need to reach out to Fulton. Do you know how old the jack is?
-- Etrailer Expert Jenny N - 04/27/2022
My apologies, I was wrong. I just bought a boat and the dealer told me it was a 5000 pound Fulton jack. But in fact it is a 2500 pound jack. I stand corrected.
-- comment by: Peter - 04/29/2022
For Fulton jacks with a 2500 capacity the gear kit would be part # F0933306S00
Replacement Bevel Gear Kit for Fulton XP15 Marine Jacks - 1,500 - 2,500 lbs
. It works with the following models, D2500, TJ1055, TJ1057, TJ1222, TJ1255, TJD125, TJ122F, XP15 L W WC, and XPF15L.
-- Etrailer Expert Jenny N - 04/29/2022


Worked well. I'm sure if I used it for a bulldog jack it would have fit perfectly, but I used it for a pro series as I couldn't find a replacement for one. I had to mill the backs of the gears down to fit a pro series.


Great news fellow 5th wheel backyard mechanics! If you're looking to repair/replace the bevel gears of an MPD 71125 Atwood/Lippert standard duty 5th wheel landing legs instruction manual, you're in luck. These gears are nearly a direct replacement. The only real modification needed is to enlarge the dowel pin thru hole of the vertical bevel gear you'll be attaching to the 1/2" drive shaft. It will need to be enlarged to 13/64 in order to reinstall the dowel pin. For my replacement, I also belt sanded the back side of the drive shaft gear to reduce the thickness from 45/64" to 5/8" to match the OEM part although I found this to not be necessary. Because I did, I used a .095" thick brass washer to back-up the gear and fill in the gap between it and the worn drive bushing in the outer housing. Once completed, pack the drive gears with lots of extreme pressure grease and you'll be good-to-go.


This product worked perfectly to replace the gears that had stripped on my trailer jack. I was glad to find a replacement gears for my Shelby heavy duty trailer jack.


The shipping was overall pretty fast, so that was nice. The replacement parts were for a Fulton jack. However, the gears ordered were just a bit bigger than what was in the jack previously. I fought getting all the parts in the jack and getting everything to match up as the gears were a bit thicker/taller than what I was replacing. Luckily, after a hour or two of fighting it, including attempting to grind one gear down on the backside, since only one old gear was broke, I just used one new gear and one old gear, so then I had enough clearance for the handle to slip back inside. It was a bit frustrating that both gears could not be used, but I guess I have a spare now if the new one gives out sometime down the road. But happy in the end not to have to buy an entire new jack for just these simple little pieces.


This is the wrong kit for a Fulton 5000 lb jack. The gears are too small, in my case the broken part was the smaller pin, so I was able to use that one piece and get everything working with the old parts.


The product I order was just what I needed. The picture with dimensions was the most helpful of all...and shipping was spot on with the tracking provided. Repaired my Bulldog trailer jack fast and easy. I would recommend this web site to anyone!


Part arrived when it said it would and worked great on replacing the gears on the Atwood landing gear I was repairing. Had to make some minor adjustments on the drill press for the undersized pin groves the Atwood application called for.


They work fine


After the kids over cranked the boat trailer jack and snapped off teeth on the gears, I thought I would have to buy a whole new jack. Instead I found your web site and was able to easily find the replacement gears that fit exactly. The trailer jack has worked perfectly since and I could not be happier with my purchase and the performance of your product. Thanks.


Thanks to etrailer offering replacement gears for my side wind jacks I saved from buying new ones and throwing more things away just because of a wear part wearing out. Every store I called told me the same thing ..."we've never heard of any one replacing the worn new jacks. Thanks etrailer for offering the parts and fast delivery. All I would say is to be sure of the hole size in your old jack handle and screw, one of my screws had a smaller ID than the new pins that came with the gears. No big deal.


The gear set worked great. it was on an old overhead camper and we rebuilt the jacks on it and it save d us a lot of money. I would definitely use etrailer again.


product as described super fast shipping. thank you for your fast service.
thank you


The replacement gear set for my bulldog tongue jack works great. I did have to shim the side gear to get proper clearance and gear engagement, no shims in the old one, maybe that is why it failed.


Was very happy with the speed of finding me the correct part. even when all I had was a description of the jack I was working on. Very friendly staff. Will use them again in the future.


This product was referenced in an on-line article, as an option for repairing older Atwood landing gear (1996 Jayco Eagle SL211) for which parts have become obsolete. For my particular application, the pin slots required some alteration as the original Atwood pins needed to be reused due to hole sizes in the shafts.
Aside from the alterations, all other dimensions performed as a direct fit.
Landing gear was repaired and re-installed in less than an hour. YMMV
Thanks to the original poster for their share of product application,
Thanks to for expedient service and shipping.
We are on the road again!


Parts worked perfectly in my jack. Very easy to install. It was far better and cheaper than replacing the jack.

It is still working without any issues.
Donald G - 08/04/2021


Perfect fit replacement. These parts are what was expected, however in general the design is weak and I will likely be purchasing replacements again in the future. That is not an eTrailer issue, but just the facts of the design.


Good product, easy installation. Backordered from Bulldog. etrailer kept me posted on the delay. Will buy from them again.


I had to do some small modifications, but only due to the parts I replaced were older, and I was unable to find any type of identifying part number to work with. Troy did an excellent job getting the closest part he could find.


Exact match of original parts. Other reviews mentioned the roll pins not fitting - the pins in this kit fit the same as the originals. Also wanted to mention, this is a Bulldog parts pack. I was under the impression it was a reproduction of original parts by another company which made me wonder about quality and fit, but this pack is made by bulldog. Can't go wrong here.


I ordered this gear for the jack for my pontoon boat trailer. When it arrived it was easy to replace within minutes solving a very aggravating problem. Thank you for helping me out.


This fixed a long term problem with the tongue jack on our 1986 camper. Operates very smooth as previous gears were completely worn down and this was the only site I was able to find these parts.


Quality parts.
Fast shipping.
I will be ordering more in the future


Product was just what I needed to repair a jack instead of having to buy a new one. Price was reasonable and delivery was prompt.

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